oscar basically lost to the best 5 boxers he faced. 
mosley x 2, felix, manny, hopkins, and fmw. who did he beat? ray leonard hype without the real results when it counted. shows BS can make u money in the states.
Lets start with Pernell Whitaker, Prime Ike Quartey, legend Chavez twice, Rafael Ruelas, Prime Fernando Vargas, Prime Miguel Gonzalez, the list goes on.
The funny things is, half the fighters you mentioned he lost to he won. You gotta be a few marbles short if you think Trinidad and Mosley 2 won those fights. I'll give you Sturm, although Oscar won on the scorecards, but Sturm did beat Oscar but if you know anything about boxing and saw that fight then you'd know Oscar had no business at middleweight, especially fighting in the worst shape of his career. Nobody other than Pac has ever dominated Oscar. Mosley was dominated twice against Forrest, who Mayorga beat twice and Oscar Ko'd Mayorga inside 6 rounds. And Mosley was also dominated against Winky Wright TWICE.
Fuk, Mosley barely beat Oscar's left overs in Mayorga and took him 12 rounds to finally KO him.