of course it's flawed. Statistically, with different numbers of reviews for the same game on different platforms, different numbers of reviews for one title vs another plus their own 'guesstimating' of reviews that don't provide scores it's a given.
Metacritic shouldn't be used for anything other than getting an idea, for that individual game, the general spread of the reviews. The second you compare one metacritic game score to another you're in error, the second you take the average score at face value without checking how many reviews, which was the highest, which was the lowest and the general spread of reviews you're flawed.
But most people want simple, quick info without worrying too much about any (statistical) bias or flaws it might contain.
Try to be reasonable... its easier than you think...
