I didn't see season 1, so far my favorite season is season 5.
Big names to come out of TUF:
In his last fight vs Kos sanchez had a staff infection. They thought it might have been hep c before the fight and almost didnt let the fight happen, a couple days after the fight diego had a hole in his thigh and it turned out he had a staff infection. there was an article on it on ufc.com