What is wrong with McCoy? I thought he was a good doctor but he was let down badly by the quality of the scripts especially in season 24. I think Big Finish have shown that he is a good doctor and I have enjoyed listening to the 7th doctor audios a lot, I also enjoyed watching McCoy in the Hobbit. Having said that I also enjoy the 6th doctor as well and Colin shouldn't have been sacked.
McCoy had a limited acting range. That was his problem.
The show certainly had a vision in the last two seasons of McCoy and I liked where it was going.