So one fight is a pattern now? The only man to dominate him is Velasquez, who has dominated everyone he's fought.
He weathered the storm and beat Carwin (the hardest puncher in MMA history IMO) fair and square, which is more than what any other top HW can say.
Granted Mir, Couture and Herring are old guard, but they're not scrubs either and he dominated them badly. Mir is still rated a top 10 HW btw and has KOd Kongo and Nog recently.
I guess Lesnar's next few fights will show if he was a true champion or not, but losing once to a machine like Cain is not proof of being overrated.