I would have to go in this order.

1. Julio Cesar Chavez- He was one of the best ever but the biggest fights of his career (Whitaker, Taylor) he looked average. To his credit he was given a gift KO from Richard Steele
2. Oscar De La Hoya- I don't hate him as much as bilbo but winning 9 out of 12 rounds in a fight that you landed 50 less punches than your opponent is all star power. That star power gave him 3 fights (Whitaker, Quartey, Sturm). To his credit he did get screwed in the second Mosley fight.
3. Riddick Bowe- He was just an asshole, and punching a guy at a press conference proved it.
4. Lennox Lewis- Talk about being arrogant, this guy takes the cake.
5 John Ruiz- No comment.