Overall, I thought McCoy was a great character who provided a valuable contribution to TOS. However, at times I couldn't stand McCoy. In many episodes they pumped up the McCoy-Spock tension a bit much, to the point of making McCoy look like an @sshole. He'd give Spock a hard time at almost any turn, looking sorely unprofessional. These guys are military trained. I know doctors are usually less "by the book", but McCoy's needling of Spock went too far.
Anyway, it was a shame he wasn't given more "meat" to his roles in the movies. I think he could've provided more entertaining dialog.