I agree with you that it is hard to hold his competition up to great fighters of the past, but Floyd was something different then we have ever seen before and as a fan of the sport you have to appreciate that.
It's not that he invented anything, but his style is unique to him. There has never been another fighter like Floyd and people will try to mirror his style but I don't think anyone will be able to do it like him.
I always thought Floyd was an underrated puncher especially early in his career he would put beautiful combos together, go to the body and back upstairs, he just has a lot of tools. Even later in his career you didn't see a lot of guys jumping in on Floyd because they got a taste of his punch early and would be hesitant to take another one.
If you dislike Floyd Mayweather as a person, thats fine, but he showed us something we have never seen before and probably never will again.