As a coach, you can expect him to be a great motivational speaker in his press conference, interviews, etc. , but what I like about him is his work in regards to making decisions:
He's not afraid to bench starters who are making a ton of money (Clements).
He's not afraid to bench future (possible) Hall of Famers (Bruce).
He's not afraid to change his offensive philosophy to suit the strength of the team (running early in the season to passing more lately).
He's not afraid to give young guys a try (Tarrell Brown, Coffee, Balmer, Crabtree, Morgan).
He's not afraid to make a change at a crucial position in the middle of a game (Smith in for Hill).
He may sometimes make decisions that are not popular with the fans, but most of his decisions are well thought out and the decisions are mostly to make the team better. Some say he is stubborn, but his actions say otherwise. I just like the fact that he does not have any fear in making changes.