Hmmm, sorry to thread hop here, but it's actually never occured to me to think that Kakashi was a horrible teacher to any of them. It seems to me that he did a fairly decent job - and the one who suffered most was Sasuke. Naruto and Sakura both seem to have a great deal of respect for Kakashi (despite the subtle insults - which seem normal to me as they become more equals and less students).

I'm not trying to disagree, I'm just surprised, is all. You've made me ponder!