I suppose the system should ask for every movie watched how they'd rank given a particular mood ? So it's "is A better than B when you want something with deep thinking to watch, is A better than B when you want something easy to follow ?" but it has its own can of worms: sometimes I want to watch something with deep thinking even though I am in the mood to unwind...
All in all, I think it's a waste of time to catalogue our own tastes and try to build a personal recommendation system. I hope/think/want to believe thank knowing ourselves gives better reward.