I've always had a love/hate relationship with Genesis: I adore their early stuff, especially the Gabriel years, and just got more frustrated with them in the 80s (I remember buying the 'Invisible Touch' LP, then flinging it across the room in anger after the first play). At their best - both band and solo - there are few to touch them (ok, IMO), but I never got on with the 'cheeky chappie' persona of PC.
There have been better Genesis documentaries: indeed, the second discs that came with their box sets had an interview per album, and was much more detailed and forthcoming. Even yesterday's programme was abridged: there is a longer version set for Blu-ray/DVD release. This may be kinder to Hackett's (and Anthony Phillips's) solo careers, and editing decisions yesterday would have most likely been made by the BBC. It was strange to see 2 albums entirely missed out though, especially the Ray Wilson period.
When they promised 'rare footage', I think most fans wanted to see more of the 1970 Roundhouse gig (there are separate audio and video recordings in existence), but alas no - a real missed opportunity. What a lot of fans have been clamouring for is the long-promised soundboard tapes (a la King Crimson): this documentary and 3CD collection is just another pointless repackaging exercise.