Most of the time, I don't really like group commentaries on DVDs because the cast and crew just end up talking to each other. But then later I found out that each commentator on the DVD was recorded separately and then spliced together based on relevancy of the scene.
I would have to say that Ben Affleck really added nothing to the the commentary. All he did was poke fun at the other actors and made annoying impressions of his cast mates. His Billy Bob Thornton Sling Blade impressions were so unnecessary
Bruce Willis sounded like he was half asleep and talked very little.
Anyways, I thought that out of all the commentaries I've listened to from the Michael Bay DVDs, Ben Affleck should've not have been included in it.
I don't mind him in the movie but he didn't contribute to anything that sounded interesting enough to make it worth listening to him.