Well given the circumstances, he did the best he could. I mean his student's weren't exactly star students. One had an inferiority complex with his brother mixed with the desire for revenge, and on top of that, stubborn as hell. The next is a useless girl who has yet to prove her worth to the group, and the last a WAY too spastic kid, with a huge amount of potential but lacks the brainpower to function properly as a ninja mixed with desire to be the best ninja, not in the best interest of the people but for his own gratification... Tough group of first students if you ask me. He could have undoubtedly do better though.
Whoever neg repped for this post saying "Kakashi is the best and he only teaches the best.", you need to reread it dumbass. I backed kakashi up for the most part, dickhole.