Hi,
It was poor and I think that DG should not have done what he did. Maybe just let the pieces out on their own, but adding a guitar and trying to make a song in some cases, was boring.
In most cases, there is something missing, and I think DG took them out.
Of all the albums, that RW plays on, including his solo albums (both of which I happen to like a LOT!), if you separate the keyboard sound, it is not aimless, and "empty". It seems to be there because it belongs there. And its design is very well done, and thought out and it is placed on the rest of the music, with a touch that is crazy ... that you and I can only dream about.
There were, way too many subtleties in the playing that suggested that this was not just rock'n'roll for RW, and it was a touch that most keyboard players do not have. It's not just a note here and there, its a feeling that continues and takes you away on its own, and in many places, like The Wall, these touches are actually against the grain of the lyrics and sound, but it helped make it special.
I doubt, that PF would have been as successful without RW. It might have had a hit or two, but I don't think that it would have put together the history that it did, eventually.