Mass Effect 3 is stuck as the latest victim of the clash between the gaming community and the publishers.
On one hand, the game is good. Exactly how good might be debatable, but I'm more than halfway through it and it is objectively a good game. It might not be to everyone's tastes, but it looks good, plays good, sounds good, the writing is solid thus far, there's emotional impact, there are interesting characters, there are varied setpieces, pretty much every character and story line from the first two games makes an appearance and gets some closure, etc. The game itself isn't a problem.
However, on the other hand, EA/Bioware's actions surrounding the game have not been well recieved. From Ashes day1 DLC, Tali's Face, 1000000 tiny pieces of DLC, that Chobot chick, etc. All this means that there are a lot of people out there raging more than they probably should have and trying to lash out against these percieved injustices (which may or may not be actual injustices, that's open to debate) by badmouthing the game, hating it, review-bombing it, and so on and so forth.
It's not the first game to suffer this and it won't be the last (Diablo 3 is shaping up to be one as well). Good games getting shit tossed at them because of the actions of the publishers.