If you say this, you've only listened to early 80s Steve Miller. Check out his blues and folk. Lots are up on Youtube. (Which, to the point of the original article, probably doesn't pay him much)
I saw Steve Miller a few years back in concert. I wouldn't have even considered myself a fan before having seen him, but I came away very impressed. I was even dreading "Abracadabra," but so help me that song was great live.
His singing and playing were both spot on. His sound was terrific. I'm a guitar player myself, and the tones he got from his Les Paul and Strat were textbook examples of classic, excellent tone. The band was tight as a band can be. It was a great night of music. The guy is a first rate musician.
I've been watching many of his live performances on YouTube. He's a great musician, who happened to ride the pop wave. We shouldn't judge him just on that. It's like judging the Dead just on "Touch of Grey" or Bowie just "Young American".