One of the world's smartest folks. In one of the world's most interesting fields. Is kind enough to take time away from his research, and his family, to share with us dummies.
Not a world-class deliverer of speeches. Seems like a forgivable flaw to me.
I've very much enjoyed his talks. I find him to be quite eloquent, sorry he hesitates more than you enjoy.
No idea about talks, but I've had two chances to participate in a living room group discussion with him, and I remember both fondly. He is one of the smartest people I've met, and on top of his field.