Most bands used to put out an album every year, and with the limited capacity of an LP, you only went with your strongest material. Now that albums are twice as long, everything's on there, including weaker stuff that wouldn't have made the cut back in the 70's. There's a push to fill the CD, and even I have fallen into that trap. If I buy a CD and it's "only" 60 or 65 minutes of music, I don't quite feel ripped off, but I feel like they could've given me more. Never mind that this is still nearly twice as long as any album from the 70's. It doesn't help that they took three years to make the album "and this is all we got". It's too easy to get spoiled by pretty much anything.
Anyway, I think my point was that the reason why I don't play later albums straight through is because they're so damned long and contain too much filler. I know, I can always hit the Skip button, but that's too much work! Something I've thought about (and actually done once or twice) is creating my own cut of the album, leaving off the weaker tracks that I'll skip anyway. Unfortunately, the purist in me finds this wrong. I'm now playing "my version" of the album, not the one the artist intended. Even if I always skip those same couple of tracks anyway. And talk about too much work. I could just put on Relayer or Close to the Edge and enjoy 40 minutes of non-stop perfection.