In no particular order:
Nick Diaz- GREAT fight against Lawler, and has gone to complete shit since then, and whats up with sucker punching Riggs at the hospital after their fight. He just doesn't get it
Frank Mir- He always has this look on his face, I can't explain it, just bugs me.
Ken Shamrock- I lost alll respect for him on TUF, going in I couldn't stand Ortiz and was a big Shamrock fan, not anymore. A guy with his experience, who has his own training camp, should have some clue how to train these guys.
Josh Koshcheck- Overrated.
Ivan Salaverry- I loved this guy, then he fought Nathan Marquardt on UFN, and they put on quite possibly the worst fight ever, so he apologized then offered to quit, which Dana accepted. This guy has a ton of talent, and instead of quitting he should have went to Dana and pleaded for a fight any fight, to redeem himself. Hell, Marquardt is still around.