Personally i can't stand user reviews, most of them are more biased than games journos. Half the time you get reviews from people who haven't even played the game, then you get little kids saying it's too hard or hardcore gamers saying it's over too quickly when they completed it during a marathon 12hr session.
I put more faith in journalists reviews, yes they may overstate how good some games are but it's generally easy to see when they do so.
For the record i put my faith in PCZone, Games TM and EGM.