Just because some reviewers said Afro Samurai is a bad game doesn't make it so either. Their opinions are no more valid than the opinion of the average gamer as far as I'm concerned. In fact, Gamespy insisted that certain ropes in the game could not be cut when nobody else had a problem with them. Anyway, being a big hack and slash fan, I paid $60 for the game on release date and will admit there wasn't enough content to justify that price. However, for $10 I think it's a very worthy purchase.
Wheelman is also worth the $13 to me. I played the demo, enjoyed it and still picked up the game for $30 even though it was crucified by nearly every review. I was not disappointed. If you can look past some subpar graphics, a pretty much nonsensical story and like open world games, you will get your $13 out of Wheelman.
People don't become reviewers just because they are able to pick up a controller. There's criticism and evaluation involved, they are hired and maintained as reviewers due to their ability to understand the market - well, if they're not just selling us product purely.