I don't even think star-based reviews are a problem--they're useful for sorting out the people that aren't happy. You can then look at why they weren't happy and see if it's a real issue or not, and if it's an issue relevant to you. (For example, a doesn't-play-nice-with-X downvote doesn't matter if you don't plan to play with X.)

What is a problem is just presenting an average of the ratings, though.