Berto sucks and all the scrubs Mayweather fought earlier had the benefit of being around when the pickings were slim because less quality fighters were around. GGG, Thurman, Garcia, Peterson, Khan (who is overrated but has flashes of talent) are just some of the names of guys who would be a much more interesting fight than this. I understand he is hooking Berto up but I'm not paying to see that.
I also don't think anyone really believes Mayweather is going to retire tying the record when it takes 1 more to claim it.