As I said before, I DON'T dislike this movie, I simply don't enjoy it! The ONLY reason I don't enjoy it is because after a while the whole bad atmosphere, which pervades throughout the sessions, affects me as well! It's like sitting down for a family meal after your parents have just had a huge row - the food is still tastes as nice as ever, but you can't wait to leave the table!
I watched this film very recently - the first 30 or so minutes (filmed between 2nd and 15 January 1969) is spent watching 4 (5, if you include Yoko) miserable faces stuck in a huge, cold film studio, playing rock and roll badly... it's pretty excrutiating! There was no magic. It was only after they moved the sessions to Apple studios on 22nd January, and drafted in Billy Preston that things livened up.
For me, the only truly redeeming moment is the rooftop concert... at least John and Paul look as if they're enjoying it!
True, the film shows the band disintergrating, but that's what makes it such complulsive viewing, and I do not underestimate its importance. But, as I've said before, it's depressing simply because the Beatles themselves are depressing.