Brook has a lot of natural talent - he's quick and has good reflexes and the like. That said, I don't think he's a very good boxer. He makes tons of mistakes in the ring, and I think they'd get exploited by a top level opponent. He's Pacquiao's mandatory, although that will NEVER happen. Frank Warren has enough pull with the ABCs though that when Pac vacates, they'll probably have him fight some scrub for the vacant title. He actually reminds me quite a bit of Jean Pascal a few years back, although not nearly as tough as Pascal. We'll have to see if he can make that jump to being an athletic boxer instead of just a good athlete who happens to be a boxer. Actually, maybe a better comparison in terms of style and the like is Anthony Mundine, although if you haven't seen Brook, then you probably haven't seen Mundine either.
brooks a good fighter but i'm not 100% sold on him yet. something tells me that he will become a world champ but will get found out if he fights a proper top class fighter.