Have to disagree. JBJ has overwhelmingly dominated every top 10 opponent that he's faced. Hasn't lost a round that I've seen. The only "criticism", if you could call it that, is that a big part of his dominance is his size, strength and reach - no one wants a piece of this guy at LHW. He's gotta move up to HW.
He's lost rounds to Bonnar(3), Evans(1), and Machida(1)