I've been watching the Spy Kids 2 with the commentary. Ron is right, it's the most entertaining and informative commentary I've ever heard, but man! Rodriguez needs to lay off the caffeine!
We had the opposite experience. We really liked the first movie (two 40-somethings with a college age son), but we loved the second. This one's on my must buy list (I'm also a 4th grade teacher now, and still relate to the younger set!)