I listened his New Hope commentary last night, I thought it was pretty good. I was a bit underwhelmed by the one he made for Episode I and I thought this was a real step up. It felt a lot like one of his reviews most of the time: funny, and also really a insightful look at what made the movie work, but he also even pointed out a few plot holes and things I never thought of before.
Speaking of reviews, I'm really wanting him to make another one.