Metacritic is definitely inflated. The whole industry is messed up and people basically use a 7-10 scale.
I'm torn, because we use a 5 star scale. I don't allow for half stars either, so each star up or down better be pretty dang meaningful. The problem is, the industry doesn't follow suit and basically in my scale a 3 star score is reserved for a sucky game thanks to metacritic problems.
In reality, we say a 1 is a bad game, a 2 is decent game with more flaws than merits, a 3 is a good game that's a little rough in parts, 4 is great, and 5 is excellent. But Metacritic makes people feel like we're cutting the legs out from under a game since in their mind they translate each star to mean 20% on a 100% scale.