GeneralTwinkle said:
They've gotta be by really good reviewers, where I know the kind of games they like.
The only one at the moment is angryjoeshow, on youtube. He seems very silly and cheesy, but his stuff is legit, and he has really, really good points.
I like him too, mostly because when he is enthousiastic and/or disappointed about a game, it shows and feels more honest than most reviewers. I don't always agree with him, but I admire his passion for the medium.
I suppose reviews affect my opinion in the sense that I use them as a source of information about a game's features, story, and so on. Whether they are good, bad, flawed, ... something that would appeal to me. For example, a reviewer may slam a feature for poor implementation. If I see multiple reviewers react negatively to that same feature, then that indicates it will likely bother me too. That wouldn't stop me from buying that game, but it could determine how I buy it: new or used.