When I was a kid and he would do the NBA games on NBC (best theme song ever to a sports event on TV) I couldn't stand him. The past couple times I have listened to him, I have really enjoyed him. I might have matured enough to understand what he is saying, or maybe he has improved with his age. He is more thoughtful in his analysis than many other guys in the field.
I also recently read "Wooden, A Lifetime of Observations and Reflections On and Off the Court" and really liked Walton's introduction. He has grown on me, like a fine wine.