It's about BETRAYAL!Out of interest, was the shit-storm about the ending justified. (and what was it about)
Ehm..., sorry.
Yes, the shit-storm was entirely justified and I'll try to cover it completely. There are spoilers here.
1) It's the Ending to the Wrong Game. The average Mass Effect play through from ME 1 to the ending of ME3 is about 100 hours. By the time you reach the very ending of the game you have invested the equivalent time of 50 feature length films into it not counting another 10 or so hours of multiplayer you may have played to secure a better readiness rating. However, in the last ten to fifteen minutes of this 100 to 120 hour marathon the writers decide to completely change the whole point of the game. You have spent the last 99 hours and 45 minutes trying to defeat the Reapers. Now a LITERAL god from the machine comes in to tell you that that's not the real point of it all. The real point is to resolve the metaphysical conflict between synthetic and organic life. "Defeating the Reapers? Oh, forget that, we've got bigger issues." Mind you this is NEVER hinted at in the least prior to this point in the series. There's not even a peep about it or the barest hint that this is coming. Just out of the blue, right at the moment you should be sending the Reapers straight to hell... they tell you to forget about that and lets do something else. The entire tossing out of the Reaper issue, the reset for this new issue, and it's conclusion is handled in 14 lines of dialogue. They threw out 99.75 hours of story to rewrite the entire trilogy at the very end of it.
2) It Doesn't Even Remember What Happened in This Game. One of my biggest issues with ME3 is that it tries very hard to forget that ME2 ever even happened. However at the end of the game the writers themselves forgot what the hell happened in ME3. You know, the game you're playing right now. I won't even get into the larger issues of the conflict between synthetic life and organic in the previous games. In this game you have the opportunity to solve the conflict between the quarians and the geth, an organic race and their synthetic creations, and have them reach the point where they are not only at peace, but working together for mutual benefit. The geth, synthetics, can be fighting side by side with organics to defeat the reapers. The AI in control of your ship can fall in love with her pilot. In ME3, never mind ME2 and ME1, we see synthetics and organics working together to fight the Reapers. Then the god in the machine, the catalyst, informs you that synthetics and organics will always fight and kill each other and you have to fix that. Oh you mean you already did? "Well fuck you, you're wrong." This is awful story telling. Organics vs. Synthetics has been a major secondary theme of the series and right up until the last 0.25% of the story it's been building to the resolution at Rannoch where we acknowledge that synthetics are every bit as much life as organics, deserve their shot to exist, and can be valuable allies against a common threat. And then the Catalyst tells you that you're wrong and now fix the problem his way. Which leads to...
3) You Don't Control the Ending, the Catalyst Let's You. After 100 hours in the driver's seat of this series when you reach the ending of it all you are reduced to the status of mute NPC as the Catalyst takes over the role of series protagonist outlining choices, consequences, telling you how things work, and then letting you pick a color since you're a super wonderful guy for making it this far. The Catalyst is in charge and his word is law never mind that...
4) The Catalyst is the Greatest Monster to Ever Exist. Some basic math will tell you that on the low end the Catalyst is responsible for the extermination of 3 quadrillion lives. That's on the low end. At it's direction the Reapers have been killing all advanced galactic life for at least a billion years. Under it's direction the Reapers are, even as you're talking to him, trying very hard to kill everyone you care about. You are this little monster's potential executioner and at no point does it ever bring this up, can you bring it up, or was it even apparently considered. You're just supposed to take this things word as law and unassailable truth and choose. Which is bad because...
5) The Catalyst's Logic is Idiotic. Right after the ending started to hit a meme popped up comparing the Catalyst's logic to Xzibit logic, namely, "Yo dawg, I heard u dont wanna die cause a synthetics so I made some synthetics to kill u before synthetics can kill u." I'd love to say this is a wild exaggeration and simplification... but it's not. This is actually the Catalyst's game plan that we're supposed to accept at wise. Organics always make synthetics, synthetics always turn on their masters, synthetics will always win and kill everyone. So the Catalyst's solution? Make a race of synthetics to exterminate all advanced organic life and "preserve them" as Reapers before they can make a race of synthetics themselves that will kill them. That's it. I'm not simplifying, I'm not exaggerating, that's the Catalyst's solution. It's not, "Use my race of uberpowerful space cthulu cuttlefish to stop people from making synthetics," not, "use my nigh unstoppable army to help organics put down synthetics," not, "Lemme warn people not to do that," no, the Catalyst uses it's Synthetic army to wipe out organic life before organic life can make a synthetic army that will wipe it out.
6) The Endings Don't Reflect the Game Series at All. During this game you make hundreds of choices. We were told that these choices would make a siginificant difference in the outcome of the game. What it all amounted to was a number (with no basis in any kind of logic) and the higher your number the more ending options you had. Not, that those choices were reflected in that ending. You could just pick Red, Blue, or Green, instead of being stuck with only red or blue.
7) What We do See Looks Apocalyptic. When you do get your ending in most of them of the Citadel, the seat of galactic power, explodes. There are millions of people on it, including many significant characters from the series. Since the Citadel explodes, they're all dead. Second, the beam the Citadel/Crucible fires makes the Mass Relays, the sole source of long distance rapid FTL travel in the galaxy, explode. We've seen a Mass Relays explode before in ME2, it wipes out all life in a system. There are Mass Relays in almost every major system in the galaxy. The ending beam makes every single one of them explode. The logical conclusion? Due to your actions you just managed to kill not just 99% of all advanced life, but 99% of the life in the galaxy period. There is no indication that this is not exactly what happens. So anyone you cared about that the Reapers didn't kill you just did. But wait...
8) The Normandy Survives, Sort of. Somehow the Normandy escapes and your squad teleported (there are no transporters in ME) to the ship in time for it to run away like a coward. In doing so a shockwave from... something, chases them and damages the ship. It crashlands on a seemingly habitable planet (won't even talk about the odds of that happening). The game ends on a scene of Joker, the pilot, emerging from the ship and admiring the sunrise on this new garden of eden (what it's alluded to be) and then, if you romanced a female, they come out and stand with Joker holding his hand intimating that they are the new Adam and Eve. Your love interest and Joker. And as a real treat if you picked destroy EDI, the AI he was in love with is slumped over in the co-pilot's seat dead. This all ignores the ugly implications that if life on this planet is the wrong chemistry Garrus will starve to death. If it's not so he can surive then everyone else does. Tali is dead no matter what once her ability to sterilize her food is gone. Even if most of the crew survives there's only about 30 of them so they'll all inbreed themselves to death meaning the only survivor of the Normandy will be Liara as she slowly goes insane in isolation surrounded by the graves of everyone she cared about and if you romanced her never actually knowing what happened to Shepard. GLORIOUS AND UPLIFTING.
9) They End the Series Shilling for DLC. Not even joking. The last thing before the credits roll is a message from Bioware encouraging us to buy DLC.
This is all the original ending that conjuored up the shit storm. The Extended Cut ending was more or less Bioware confirm that they neither understood what the problem was and giving us the middle finger for complaining about their "art."