Tough as ****, fights at a world championship level, and in some done himself proud..Considering he had no amateur experience to speak of and never took it properly serious, hes done well, very well. I actually class him as a bit of a wasted talent
In his prime, I agree, one tough dude, but when a commission is helping you weight cheat, and you have 20 pound weight advantages, you can be viewed as a tough dude as the punches of your smaller opponents bounce off harmlessly. He feasted on perennial bums, and looked mediocre half the time. When your best wins are Andy Lee, and Sebastian Zbik, that isn't saying much.
When he fought someone his size, he got TKO'd by Fonfara. Who himself more a 'contender level' boxer.