I thought the Simpson commentaries were worthless. They rambled, talked about about things amongst themselves without explaining it to us, laughed at their own jokes and never really revealed anything interesting. I listened to the commentary for the season 4 monorail episode, I hoped they would explain where they got the idea and why they wanted to parody public transportation. Matt Stone and Trey Parker said so much more in half the time (South Park commentaries don't run full episode length) and revealed a lot of great information.