Actively corrupts media review scores by removing legitimate reviews and leaving up fake/artificial ones. Has a past history of removing valid user negative reviews for a game and allowing provably artificial positive ones.
The review scores on this website are not objective, may be corrupted as a result of the site staff's bias, and are not to be completely trusted.
I wasted too much of my life not knowing about this site. It's the best place to find out what the critics think about pretty much any medium. I really like their Music Monday article, too, which tells you everything you need to know about the albums coming out any given week.
This should give a pretty good average of ratings- but remember that online ratings are highly subjective and are hardly infallible.
Keep that salt shaker handy because you should take every rating with a grain of it.
This site is great for reviews on computer games. Or that is what I use it for anyway. This site sums up reviews from all the big review sites, and let's you know the average score, both by news sites, and user reviews. Also, Steam (valve) are showing the metacritic score on each game on their store.
Other than the questionable ratings people give to certain movies or games, the site is a good reference for what has been released recently and gives a quick and easy way to find a new movie you'd be willing to watch in a movie theater or rent at home.