Orson Scott Card has been one of my most influential writing teachers. I went to every lecture he gave in Utah when I was in college, and they had an enormous influence on me even though I have read exactly ONE of his books and just a handful of his articles.
This: http://www.diabolicalplots.com/?p=1042 (about half-way down) pretty much sums up what I think about writing, English teachers, editing, etc.
It's a short must-read for writers.\
Skip to the middle if you don't want to read the whole thing (although it's all fast-paced and interesting), right to "The main advice is:...." and read from there.
Wow. The man is brilliant.