Full disclosure - have never been a Pink Floyd fan. As a musician I respect what they have achieved, some of their tunes/production techniques, etc. Waters & Gilmour definitely have talent. Except in rare instances I want music to be a positive, uplifting experience (even a 'sad' song) and I never got anything from Floyd except hopelessness, negativity and of course drug references. Being happily drug-free all my life I'm afraid I can't relate.
As for Syd Barrett, he made his choices and was physically/mentally unprepared for the drugs or their aftermath. All around him did their best to coddle this 'genius' but even they had to pack it in when they realized he was a casualty. They do their best to be patient, but these poor guys are asked about Barrett in every single interview! Enough!
'Interstellar Overdrive'? More like 'Earthbound stuck-in-neutral half-arsed noodling in a desperate attempt to conceal a lack of ability on the guitar.'
I was surprised to learn that members of TOTO (they were highly sought after session musicians before and after forming TOTO) played extensively on The Wall. Apparently, the story goes that Roger Waters was annoyed with Gilmour and company's inability to get "the mood" of Water's masterpieces, so he brings in Jeff Pecaro and Steve Luthaka (Pecaro is credited while Luthaka is uncredited). If you play early TOTO (circa 1979 Hold The Line and I'll Suplly The Love) you'll hear elements of Another Brick In The Wall and Run Like Hell. Pecaro's contribution to precise synchopated drumming is loud and clear on the Wall.