I frequently see a guy in Chicago who commutes on a bicycle while wearing a full face visor motorcycle helmet. He also wears a yellow safety vest. I don't judge... wear whatever you want. A motorcycle helmet seems like it would be insanely uncomfortable for biking, both hot and heavy. I have tried wearing a ski helmet (not full face) for winter riding and even that felt very bulky and heavy, though it did keep my head nice and warm.
I'm assuming something like the Giro Disciple would have much better venting than anything you'd find in the ski or motorcycle world, but probably still runs pretty hot and heavy compared to a regular bike helmet. Pair with goggles for maximum effect.