Most posters are right, apart from Gilmore, Pink Floyd aren't great musicians and if you listen to their 70s studio albums they aren't virtuoso in any way. Also, compared to prog rock bands like King Crimson, Yes, ELP and the like, they aren't very sophisticated either.
Gilmore has a unique sounding voice and guitar, Waters is an okay bass player, could write a good lyric (from a very mard arse middle-class perspective) but singing-wise he couldn't carry a tune in a bucket.
What makes them better than most of their peers is their experiments ambient sound and mood. If you let it wash over you (especially armed with a good set of headphones and some sort of artificial stimulant) it's quite engaging and pleasurable, but not much more than that.
Though you can't really expect much more and I get very little of that from today's music.
Also, seen 'em a few times (on freebies) and they did put on a good show but I only listen to the albums as far as The Wall.
Waters' Pros and Cons album is pretty mint though.