Yeah on the surface it may seem weird to some. However, if you enjoy a large variety of music like I do (I even like some rap) than its not a big deal. Heck, you just have to enjoy music period to enjoy the true legends of the industry and their talents (not that Nickelback is a legend group just yet, I just like them, but they aren't legends).
I like Sinatra, Elvis, Cash, Jackson, even a tiny little bit of Madonna (due to my wife being a huge fan). I even adore Johnny Carson even though I only saw his final two years of his career in show business. I have Carson's greatest hits video package and he is brilliant. Just because I wasn't there in the 60, 70, early 80's doesn't mean I cannot appreciate his true genious. Because nobody can touch him even today.
Same with the Elvis, Jackson, Sinatra, Madonna performers.
Michael may be a lot of things but he is a genious performer. Same as Elvis, Frank, etc etc they all have their hang ups personally. But, there is no denying their talents or their genious.