Ah I see. He is very limited really, in terms of MMA. Physically, he's not quick, he's not strong, he has no KO power, he's got relatively short arms and legs and he never looks in good shape. Outside of heavyweight he's probably the least athletic guy in the UFC.
Technically, he's got no kicking game at all, his boxing is rudimentary and his head movement is not very good.
The only reason he's in there is his incredibly precise Jiu Jitsu. His game relies on trapping and tricking though, so his opponents can prepare for him and reduce his chances massively.