I agree completely and the funny thing is, I AM a critic - reviewer :)
I'd like to point out one thing though. Not every reviewer is thinking that his word is God's word or something. There are plenty of reviewers out there that give information based on what they've played and take into consideration (in the ways it's possible) to help readers to see whether a game is actually a classic-to-be, a worthy purchase and all that.
It would be too harsh to define every reviewer as people who think they own the right to bash / praise a title, because that's not true either.