I agree, the potential is there for him to become better (ie. more entertaining). But the problem is, you can say that about just about anyone. I think we can only judge a fighter based on what they've shown us in the ring. So far, Rashad hasn't shown us much. His last five official fights have gone to decision, and of those, only two were unanimous decisions. His TUF2 performances all went to decision. If I had to guess, I'd say he'll never finish his fights. It's only a matter of time before he works his way up the ladder, and then he's going to fight someone that will finish *him*. And then after that, no one will want to watch Rashad Evans anymore.
I don't wish this on any fighter. These guys deserve a lot of respect for how hard they train, and then how hard they fight in the ring. I wish all fighters were exciting. But they're not. Rashad is one of the worst.
To his credit, I think he did show a lot of improvement in the last fight, especially with those slams. But he's got a lot of making up to do. You know, I think the guy could earn a lot of respect by fighting someone like Forrest Griffin or Tito Ortiz, who is going to make him work to stay alive. One of his biggest problems is that he's only really fought guys that aren't finishers.