Irrelevant. If a game is good, its rating will survive a raid of unfavourable reviews.
You realize your talking about the internet here and an arbitrary score mostly added by a small sector of the whole base(In the case of ME3's so far, angry fans, people who just enjoy hating on things whether the game, Bioware, or EA, trolls, spammers, etc. But also fans and sympathizers)
And we've seen many bad games(In the context of Bethesda i.e. Morrowind) receive favorable scores over good games before(In the context of Bethesda i.e. Daggerfall)
Or any mix of the two.
Point is the user scores on Metacritic and beyond like IGN are woefully on the spammer/troll side and if not [censored] others have to do with it.
I'd infer the importance of this lies in the fact that thousands of people look to a score whether from the Outlet or Users and immediately judge a purchase off it because they presume their less likely to get burned rather than if they bought a 6.0 rated game that they actually read a review of. Some don't have that sort of time. Others don't care.