Never really gave much thought to Peterson beyond what to me felt like an entirely mechanical approach to playing. Daniel A mentioned upthread the fact that he was releasing albums on MPS and honestly, that fact probably kept their rich and weird catalog funded...
An ex-girlfriend of mine's father was very into OP, dazzled by him, and was also a huge fan of later Return To Forever. I think it was the technical aspects of the playing that he was into, more than anything else.