Just watched this yesterday. Got to say he's a very interesting chap, though possibly not a man I'd hang round with - I've met far too many ex-overdoers-of-drugs, and it's always a one-way conversation. Still enjoyed the film though, more than I enjoyed The Invisibles if I'm honest. I still prefer his 80s stuff - Zenith, Animal Man, Doom Patrol - I've never quite got Superman, even when written by Alan Moore.
Bit weird the way there was absolutely no mention of Mark Millar whatsoever, mind you, let alone input into the documentary. I wish I knew what was going on there. Not a whole lot of 2000ad mentioned either, but to be fair he was a DC reader from the start, which is fair enough.