I have no published novels, but I make a full-time living writing non-fiction right now. During college I took quite a few writing courses on a variety of subjects (poetry, short fiction, legal writing, etc). I had great teachers for all of them, so I definitely found them to be a valuable use of my time.
I would suggest, if you are taking college writing classes, to try and talk to the professor ahead of time. Yes, I mean go to office hours for a professor you don't have yet. They'll be glad for the visit. Ask them about the structure of the class class and their philosophy on teaching writing. See if their answers jive with what you are looking for from a class.
Plus, if they aren't willing to give you the time of day, they are probably worth avoiding as teachers anyway.