I like that he became champ finally, but I would only favor him over Vitor, and Whittaker (only because he doesn't really have a signature big win to gauge him by yet). The only guys I think would beat him handily are Jacare, Romero (if he does it in the first 3 rounds), and Rockhold (yea, I know he just beat him less than 24 hours ago, but watching them objectively Rockhold still looks like the better fighter).
Bisping seized his opportunities, and much respect for that, but objectively speaking, just because he's the champ at the moment doesn't automatically make him the best in the division. MW is kinda looking like LHW post-Liddel, pre-Jones right now.