Saw a thread from months back addressing this issue, and as the original topic wasn’t about that, started this rather than resurrecting the original thread.
http://boards.straightdope.com/sdmb/showthread.php?threadid=7756
My own view is that Miles was a genius. He started more musical redirections than anyone else. The way he reinvented himself, but still remained true to art and music is amazing.
People who say his sidesmen are better than him are not noticing the amount of sidesmen he had that became great musicians. This is because (and they all support this) he was a revolutionary musician who taught them new ways of approaching music, and they learnt a lot from him.
People who criticise his performances in the last decade of his life don’t realise this he was not in good health. He was very sick for lengthy periods in the 80’s, and sometimes played more than other times. Cut the guy some slack, he should have retired by then, due to ill-health, but still had so much more he wanted to give. Besides, the sidesmen had been well-trained enough to deliver Miles’ message without needing maximum input from him.
People who think he was an average musician, and others were better technically are missing the point. He was technically good (not excellent) but it is his approach to music that makes him such a genius. He has furthered jazz in all directions more than anyone else in the latter half of the century. Some experimentation has failed, as is only to be expected (the sheer amount of work he has produced, and the daringness involved in each project means that risk-taking is involved and in such a long career, some risks are not going to work).
Any comeback? Don’t know how many people on here are into jazz…