For someone like me who didn't watch much of Dave Chappelle or who isn't big into the hip-hop music, I was actually pleased with this. Maybe it's with the help of Michel Gondry, who I read/seen on TV say that he wanted to humanize the whole experience, both of the artists and the audience. That he did as I was completely moved and knew if I had been there, I would've felt the spiritual connection with the audience that I'm sure those there felt.
I think it was definitely worth the near 10 bucks. A fair amount of good rap/hip-hop music (dude, I was even bobbing my head), a fair amount of interviews, a fair amount of comedy, and a fair amount of social commentary. This movie provides a face for the reason why hip-hop is relevant to our culture. And, I seriously give mad props to Dave for getting GOOD rap acts for his party.
Ultimately, I think it's actually better going in not knowing what to expect from it as well.