Even if a professional reviewer's review is worth more than a fan-review, it isn't worth more than a thousand fan reviews.
Typically when I want to buy a game I look at the steam reviews, read some of the positive ones, and then filter out the positive ones and read only the negative reviews.
If the worst someone can say about the game is something like "It is different from an older game" or "It just doesn't feel right" I'll almost always give the game a chance.
