Most of The Dark Side of the Moon and Animals are deep too, but The Wall is just a whinge.
It is, that is probably the only Pink Floyd album i don't like, mainly because it was all about Roger Waters, That's not even a Pink Floyd album, Waters wrote all the lyrics and music, so that pretty much makes it a Solo album
On Topic:
Hawkwind - We took the wrong step years ago
In my opinion a really deep song about people destroying nature.