I've got no problem w/ users rating games; hell, I have no problem rating the games that I play, either.
BIG DISCLAIMER & note though = "Ratings" are so very, very, very subjective -and- are basically just 1 person's *opinion* of the game in question.
For example: Me, Kimimi, Erik, and Brad *might* rate certain games similarly...I'd always rate Disgaea games highly...however...for many other users who aren't into steep learning-curves, necessary (post-game, at least) grinding/farming, and a time investment of 100+ hours; obviously, the game would/should get & reflect a very low rating for them.
There are others into Shooters/Shmups, etc -that- even if rated highly by others, would still always (simply by default) never rate higher than a 1 or 2...to *ME*.
I mean, I'd be happy to give my opinions on games, and I can enjoy reading other's opinions of other games & genres -but- as a device to convince/disuade another member here from spending/not spending their money (unless, of course, we're only talking about a few bucks); I think it could have horribly negative (unintended) effects...
*subtracts 2 cents from checking balance*