So I've never really listened to and PF album outside of DSOTM, The Wall, Animals, and WYWH. I've been going through the others recently and, while I can appreciate them greatly, they aren't as good as those four. Here's some of my thoughts on the ones I've listened to:
Ummagumma - their most out-there album I've heard. Probably something no one but a die hard PF fan would care for. It was interesting but I doubt I'd listen again.
Meddle - very pleasant album. Echoes unfortunately was a disappointment, probably one of the lesser tracks on the album.
A Momentary Lapse of Reason - Totally boring, I did not click with a single song.
Final Cut - VERY impressive. This is the Pink Floyd sound that I love the most. Very desperate and melodramatic. Love it.
The Division Bell - Very very good, but a very different beast from the Roger Waters albums. It had very beautiful solos and I would not be surprised if JP got a lot of inspiration for his tone from this album. Very nice.
The Piper at the Gates of Dawn/A Saucerful of Secrets - Pretty awful.