I thought it was an amazing rockumentary. Yea, Lips is beyond bi-polar. When something goes well, then life is the most beautiful perfect thing ever, if anything doesn't go perfectly, then screw everything life is piss.
I'm not sure if any of the drama was played up for the movie, but it seemed rather genuine..........and it made me also wonder how the band could have lasted as long as it did given their personalities and lack of success.
And you bring up a good point about the other famous musicians interviewed, I don't think a single one of them did or was going to do anything in the least to help the band. That said, I doubt the band knew they were interviewed at the time, and thus never asked them for any help.