I mean, if you want to say that price shouldn't effect a games review that's a completly different arguement then claiming EGM and 1up are biased because they take the cost of games into their review.
I think there is a place for price however. Because otherwise your cheaper games like PSN bowling or Dig Dug would get a 2. Because they're being compared to megablockbuster games like Heavenly Sword.
Whose going to buy a game that's a 2 even if it is only like 5 dollars. Dig Dug is a lot of fun too. Plus then there is no way to state how much a difference there is from a good 5 dollar game and a bad 5 dollar game. So reviews are going to be worthless for Virtual Console/Xbox Arcade/PSN games.
It makes sense that games be judged by other games in their price range.
