Did you even read the issue where Deadpool got handed his ass? He was sitting there, talking about how friggin cool it was to be fighting the Cat. He might as well have been sitting there drooling.
Deadpool is really popular for making himself look bad- but - we all know he is a MUCH better fighter than he normally leads on. At least when he wants to be.
He should definitely be in the class with Wolverine, but I'm thinking Wolverine, Ogun, Hercules, and Thor should be a little lower. Karnak and the Black Panther should be a bit higher, as well.