Whitaker should 100% have had the win over Chavez Sr, and you could argue that he really beat a prime Oscar as well, even though Whitaker himself was past his prime.
Pernell was also robbed the first fight against Ramirez as well.
People really don't remember how great Pernell Whitaker was.
So, that's 3 possible fights he arguably won with bad judging. Marquez, though very different fighters and Pernell is better of course, is sort of like the Pernell Whitaker of this era. Marquez arguably beat Pacquiao all 3 times, Norwood, and John.