Maybe Miles was a bitter, arrogant, contemptuous guy in person, but that doesn't affect my appreciation for his music. I wonder how many great musicians were really likeable people?
I don't even think that Miles fully realized what he was doing for jazz music, but just as with the likeability question, who cares what his intent was?
One of the things I really like about those 3 albums, and some other stuff he did around that same time, like Live-Evil, is that they really have a spacy, impersonal quality to them, like it's just instruments talking, not musicians.