In short, forget what you've learned about 50 Cent games in the past. Somewhere in the beginning of the development process of Blood on the Sand Fiddy himself sat down with the developers and said, "Seriously, don't embarrass me this time. A bad show? A bad album? It happens, but this is a video game, and my friends are going to play it. Make me look good."
Is it derivative? Yes. Is that a bad thing? No.