I actually talked with Double at the Oakland show about this (I've got in on Blu-ray too, and watched it a couple days before the show), and he'd seen it. He said that he liked it a lot, but it was really rough on him, seeing Phife deteriorate the way he did (he's always been a huge Phife fan), so he probably won't be able to peep it again for a while.
I agree that it must SUCK for Ali and Jarobi. What do you do when things between your friends wind up like that? They both seem like really stand-up homies, and I feel like they were really the anchors. Ali brought the classic beats, and Jarobi, while he didn't actually do a full-on rap for any track, still provided a lot of support for the group through it all (he did the first album's narrative interludes too).
I'm a little disappointed that they didn't cover the movie's namesake album a bit more. It would've been interesting to see the whole story, not just albums 1, 2, 3 and then BOOM "rock the bells" tour. I probably would've been okay with them skipping The Love Movement though, haha. Not trying to diss... just... I happen to really like BR&L. It's a d*mn good album.
I think Phife and Q-Tip just let pride f*ck with them too much. I feel like Tip was the active "d*ck" and Phife was the passive "d*ck"... like... Tip could've been less "rockstar" / more empathy, and Phife could've tried to ease the sensitivity a bit. I'm not even gonna front, I've seen a lot of people go through hardcore bouts of diabetes (some of my friends even ended up getting limbs amputated), so I know that you're entitled to a bit of sensitivity, but Phife crossed that line a few millimeters.
I still think I'm slightly more on Phife's side though; Q-Tip's just never hit the highs that he did after ATCQ, and I think for cats like him and Busta Rhymes and Mos Def and a few others, they are drawn by the allure of the media machine and that commercialism, but they are trying to stay rooted, and... well, I think they've lost a piece of themselves to that allure. I hope I'm not riling anyone up here.