I've read plenty of comments from people by now who love boxing but hate Floyd because his style is boring to watch in every fight, and that's an opinion held not just by fans but among a lot of other boxers as well.
And I fail to see how Manny was "dominated" when he got in plenty of good hits and was the aggressor in the fight. If he took the same boring approach that Mayweather does, there wouldn't have even been much of a fight at all. If I recall, the official score at the end was 116-112. I'd call a four point difference pretty close. The first time they showed the score card (which was after the fifth or sixth round, can't remember which), the score was only 58-56, and the second time only 97-93. Going by what the judges thought, it was a pretty close fight throughout.
I read it can't be Khan because a fight in September would "fall too close to the end of Ramadan for him to get comfortably ready to fight, and certainly at this level." I hear it should be Keith Thurman. He has a 25-0 record with 21 of those victories being KO's, is young and in his prime, and is considered a good puncher.