A recurring phenomenon in TUF is that one guy who thinks his the best fighter in the world ever and talks about it over and over again, until he gets defeated in his first fight:
Season 1: Chris Leben
Season 2: Melvin Guillard
Season 3: Ed Herman (differs from the others by actually having some fighting in him to back up his words, but makes it up by being the most annoying of them all)
Season 4: Nobody, because they were all fighters trying to make a comeback, and therefore were more in touch with their skills.
Season 5: Marlon Simms
All those four guys are right there at the top. The only TUF competitor that is as annoying as them would be Gabe Reudiger.