It's only based on 9 reviews though, which isn't much.
But the 9 reviews are based on all 5 episodes as a whole.
So far, it's the highest rated game of 2012. An is rankings are only below Red Dead Redemption, Bioshock, and GTA IV as the highest rated metacritic game of all time.
And, needless to say, it's TellTales highest rated game series by far to date.