I never saw this thread, and I'm happy I've found it. This album is the most mature Pink Floyd album; Roger Waters is a musical genius, at least that's what I think. David Gilmour really shows his versatility during this album, as his guitar work is phenomenal. Yeah, Dark Side of the Moon and Wish You Were Here are great albums too, but this album is all over the map, and the re-occurring musical themes (like the delay-drenched D that Gilmour constantly returns to) get me everytime.
I neglected this CD for a real long time, as I thought it was too "out there" for me. However, now, having started recording a few years back, listening to The Wall helps me think beyond the idea of mainstream. It's helped my own mind (musically speaking) broaden. It's just different.