I thought Mayweather beat Castillo but it's a 50/50 with PAC JMM 2 I tend to score it differently each time I watch it.
With the castillo fight it depends on how you score fights and how much of HBO's commentary you were listening to
I say Pac-JMM II because not only was the score close to even, many rounds themselves were close to even as well.
Mayweather-Castillo I. Floyd won a close fight that could've gone either way, I had it for JLC by a point. Marquez won 8 rounds as was robbed. The decisive majority of all experts, fighters and writers had JMM winning. The fight was close in a sense, close but clear for the Mexican.
I thought Marquez edged Pacquiao, HBO commentary was leading people to believe that Pacquiao was winning. The best I can give Pac is a draw. I thought Joy won the Castillo fight by 1 or 2 points, and I could also see a Castillo victory by 1 or 2 points. So I'd say that the Mayweather-Castillo fight was a closer fight than Pac-Marquez II, however I felt the wrong man won the latter.