You're right, to a degree. Your problem is that you posted bands which are, all together, too good to really be victims of their own sucess.
Every follow up (3/4 Pavement LPS, BSS s/t, and Twin Cinema) all might not have been as good as the original masterpieces (Slanted, you forgot it in people, The Electric Version), but every one of those albums holds it's own out of context. And they are all outstanding and very popular and well known. I don't think that the previous records greatness detracts from all the following albums - it just makes them more popular and maybe adds expectations, which can cause a bit of dissapointment at not quite matching the previous greatness.
But, i'll give BSS for an example, on first listen I knew that the s/t wasn't quite as perfect as You forgot it in people, but the more I listened, I realized that it had it's own merits outside of the BSS's history and know I like the album for it's own reasons, but because the band produced the previous album.