Season 1 and Season 5 where the best no doubt.
Season 2 kinda blew. I mean Joe Stevenson did well, Rashad and Jardine have done well but other then that it's basically just Marcus Davis.
3 fighters isn't that good.
I mean season 1 had Forrest, Diego, Florian,and Koscheck who are all contenders at their divisions. Swick, Leben, Bonnar, Quarry all those guys are legit MMA fighters.