Well, he did knock out the king with his wall, and busted Hack's hand open. He also took out that marine spy off-screen. I think he was supposed to be at least rear-admiral rank.
Yeah, but like we said, that's really just all his powers. And it doesn't necessarily make him a good fighter.
Watching Bartolomeo fight someone that doesn't understand his powers is like watching a Logia user fight someone who doesn't have Haki.