He's alright.
He has quite a bit of range, but, my biggest problem with him, is that he tries to use waaaaaaaay too much of his vocal range, like, all the time. Plus, I overall don't really like his harsh vocals and his rapping. There are a few songs where I enjoy his use of those vocal ranges, but they're pretty sparse.
I think the comparison to Patton is good. They're both extremely versatile singers, but, they also seem to overuse their voices too much. There's something to be said for exhibiting a bit of control.