Doc's strengths: player (personality) management, certain in game situations like plays off of time-outs (both defensive, but more-so offensive), motivating players, engendering loyalty in players and public speaking and PR
I am sure that there are others that I have missed.
Doc's weaknesses: Minutes management, timing of player substitution (strategy-wise to take advantage of match-ups, not just the aforementioned minutes), timing of time-outs during opposing teams runs, not trusting rookies at all and seemingly sometimes having a preconceived notion of a player and almost being impossible to get moved off that position.
As with the positives, I am sure that there are some negatives that I have missed.