I think he's good, but he's never really been an A-list actor. Why is that? Is it because of his old drug habit? Is he difficult to work with?
It can't be because he isn't a good actor (which I think he is), because let's be honest: Harrison Ford ain't no Laurence Olivier, and he's done rather well. Come to think of it Harrison and Dennis look pretty much the same, as they have the same kind of leading man looks (to be honest, Harrison looks more like kin to Dennis than his real brother Randy).
I just think it's strange that he's not a bigger name.