I think Oscar has been incredibly unlucky in the ring, yes he had some close decisions go his way (Whitaker and Quartey) arguments would have been made the other way had he lost those fights. He was robbed against Trinidad and he beat Mosley the second time yet the judges amazingly score that one more convincingly for Mosley than the first fight which Mosley clearly won.
I think it is here where you need to go back and take a look at Oscar psychologically, he really wanted that win against Mosley, his main competitor since they were kids. Oscar simply hasn't been Oscar since that loss and it has showed, he has been confused as to what weight class he should be fighting, 147lb or 154lb and he looked awful at 160lb then back to 147lb, surely this puts a strain on the body. He should stop now before further embarrassment occurs, he is 35 and it really showed against the Pacman.
Despite his critics he has been the most watched fighter since Ali and Tyson and he deserves a lot of credit for keeping Boxing in the Sports pages a little bit longer.