I hate "respected" teachers who are just famous, and doing a number of jobs at the same time.
I'd want my professors to be one because they actually like teaching, not because it looks good to be called 'Prof. Shitnut'.
I had one who was a senator, and during his lectures he would just read from his textbook that didn't change since five years or so. Hell, he even got an assistant to put his book on the right page in his desk before he would arrive.
One time, he even distributed his campaign flyers during an exam. How fucked up is that.