I wouldn't say metacritic is bad. It is just an average of what a bunch of people thought of the game. Basically, it gives the user an idea of what the review community as a whole thinks of the game.
Generally, I will look at the IGN review (which is probably the most important review to me because they are generally pretty good at assessing a game) and metacritic if I'm thinking of getting a game I am on the fence about. The IGN review generally isn't that far off of the average. In fact, most game reviews on metacritic aren't that far off of the average.