The fact that Hunt was KOed by Melvin and submitted by McCorkle doesn't change the fact that he's just defeated Rothwell, Kongo, and Struve in succession. That's an impressive feat for any heavyweight. JDS went on a similar tear and people were calling for a title shot. You can't deny Hunt his due on the basis of the past. Chael Sonnen has a less than stellar MMA past, and yet he managed to string enough wins together to get two middleweight title shots, coming within inches of defeating Anderson Silva.
Mediocre past. Stellar present. Unpredictable future. If anything, it just shows that a man can better his craft if he decides to actually take it seriously.