If you want to talk about general reception for those bands and the records that are seen as their best, the only one that stands out is Meddle. For me personally, Meddle *is* one of my favorite Pink Floyd records, but I certainly understand it being considered second-tier, below the obvious choices (Dark Side, WYWH, Animals... possibly Piper).
the rest of those albums are all considered to be among the best few that each band put out, I would say, right?
yeah, it's quite a random poll. but he did say "classic rock/pop," not "favorite Beethoven piece" so I don't know what you're really expecting. this board isn't going to follow your lead, you know. (sorry, I can't resist being an arsehole)