I have taken a few writing courses, thinking that I might learn something from someone who actually made a living writing.
The experiences were all disasters in one way or another and the first course should have tipped me off. The instructor was a complete idiot who hadn't been able to make it as a writer or a critic so had gone into teaching others for, what I considered to be, the sole purpose of ensuring that nobody she came into contact with ever felt they could write either. She spent the entire eight weeks pointing out every single flaw in everyone's writing and pointing to her beautifully MLA formatted work as if it were the Holy Grail, only problem was that it was so sophomoric that insipid that you honestly felt it had to have been written by her 13 year old alter ego.
The experiences didn't get much better than that.
The very best writing advice I have ever received was from on English professor who had been in a soap opera prior to going to college and finding meaningful work (his words, not mine).
The advice was quite simple: write something down!
After having spent several years in college and then several years out of it my belief about writing, and nearly everything else, is that nobody can teach you something you can't learn. Oh, and a good book is far less expensive than taking a course. As far as feedback goes, which is important to a writer, or anyone who endeavors in the creative areas, there are always people out there ready and willing to give you all you'll ever need; after all there are at least 100 critics to every writer!