Phil, my understanding is that people don't look at it as a real Floyd album because it was all written by Roger Waters, so it's more like a Roger Waters solo album with members of Floyd playing. Also, I think the keyboard player was out of the band, though I'm not sure.
For many people...
Rush- Permanent Waves
Overshadowed by Moving Pictures, but every bit as good.
King Crimson- ConstrucKtion of Light
Their most recent studio effort and the realization of the probing experimentation of the ProjecKts. The title track alone is worth it.
Deep Purple- Fireball
Bluesier and...