I can maybe understand how someone could say Pink Floyd is a bit cold - some of their stuff is kinda depressing, I'm sure we all can admit - although I would counter that person probably hasn't listened to them in any real kind of depth.
Emotionless is right out to lunch though. The vocals (both delivery and lyrics) and music are the polar opposite of emotionless, from Gilmour's mournful cries at the end of A Saucerful of Secrets, Rick Wright doing Us and Them, Waters on the second half of Hey You, even Mason's drums on One of These Days (go watch the Pompeii version and tell me that isn't incredible)...there are countless examples, and this is a huge reason why I love Pink Floyd so much.
Emotionless? Hell no. Anyone who says that should consider that it might be the listener.