the wall is, as a whole, pretty bad actually but there are some good songs in there, buried in the swamp of a mediocre & overblown concept album
I... agree with this Parama take. I can see why people like it, but I think a lot of the songs are just sort of there. And I find the concept and Waters' overall lyrical approach obnoxious at best and distasteful at worst.
Dark Side of the Moon lives up to the reputation, but it's the only PF I've heard that I actually enjoy start to finish. And even then Money is a clear weak point.
What other classics are there? Well, here's sort of one:
I really like Rush, but I think
2112 is overrated. The song itself is quite good (and it was my first ever epic), but the second side is pretty meh. Something for Nothing is the only song I would recommend. Passage to Bangkok, Lessons and Tears are fine and I don't like Twilight Zone.
I think that while
2112 is a big step up from
Caress of Steel (where I would only rate Bastille Day and Lakeside Park) and obviously the step they needed to save their careers,
A Farewell to Kings is the album where Rush actually hit their stride, and is the beginning of their very good to great run that goes through at least
Grace Under Pressure (I have yet to get the albums beyond this besides
Clockwork Angels.