He's an ATG and HOF in my book, that was robbed of a lot of decisions, and deserved at the very least one win over Pacquiao. Sort of similar to how Pernell Whitaker was viewed, a great fighter who was robbed in questionable decisions a lot, only Pernell is still better than Marquez of course.
Norwood, John, Pacquiao I-II-III, all decisions that were questionable. The only time Marquez was convincingly beat was against Mayweather. I thought Marquez won the Norwood and John fights, as well as the second Pacquiao fight. I thought Pac won the first fight and the third fight could have gone either way.