I would say they do, to a degree. I like to read several to really see what the game is going to be about and see if there are any similar complaints (so I know what I'm getting into). However, there are quite a few games I have that I knew I'd like just based on the genre (2D shooters primarily), and others that simply intrigued me because of their premise (Ribbit King comes to mind).
However, I've found that what people often take as a "bad" review (usually anything lower than an 8) doesn't necessarily reflect on the enjoyability of a game. Take Road Trip (PS2) for example; it didn't rank that high due to its more simple and cartoony graphics, but the gameplay was solid and the premise was neat (a "CarPG" as I remember reading). So yeah, take reviews with a grain of salt, and ultimately decide for yourself.
I can't wait 'til I'm old enough to feel ways about stuff.