9/10 is still good. But i'll say that uncharted has had more precise scores vs well other games which have the same avg review score. Mostly all reviewers have given the game 9.x or above for uncharted 2, so that means its very precise to say its a very good game. Compared to halo 3 odst where the scores are literally all over the place, you cant really tell whether its a very good game or not even though it has a positive avg review score. The Highest for ODST is a 96 while the lowest is 42, yea... (metacritic)

Having said, you cant really complain at EDGE for giving it a 9 and a 9 only, it means that while they dont think its the absolute best game they've played, they still think its a very good game. Kudos to that.

I agree, too often the cohesion of scores on sites like metacritic is ignored.  The other problem with Metacritic (well, one of many really) is that it tries to take differing scales and collate them - this means for Edge, everything jumps in 10% from one score to the next (70%, 80%, 90%, etc) while other sites might award 9.5.  With metacritic always seeming to have an inconsistent number of reviews per title (another big, big issue) the average can easily waver around.

In other words, if you're going to look at an average, understand what's behind it.