Basically, I love reading reviews, but only when I'm right on the fence do I rely on a review to sway me. More often, reviews warn me of the games I need to stay far away from, and it's at times like these that I read EVERYTHING to see if there's a consensus of some sort. I've seen reviewers pan a game that I absolutely adore, and if I'd've followed the reviews solely, well, I'd have been unhappy for all time.
I enjoy IGN Cube, but I read most online sites and print mags, although I only subscribe to EGM, a magazine I trust a good deal, mostly because I'm so familiar with the reviewers' tastes.
In the end though, the case is: I just love games, I love reading about them, arguing about them, looking at them, admiring them, etc. I think the more you know about gaming--the more experience you have with them-- the more you enjoy the subtle things that stand out and set great games apart from good ones. This applies to movies and books and most anything else.