Playing Heavy Rain and then playing a fighting game aren't really the same. I'm not saying fighting games have compelling gameplay as opposed to just pressing buttons when the game prompts you to, but Heavy Rain could have had none of that QTE business at all. Yes, some missed QTEs/choices can change the story, but not to the point where I can consider it "gameplay".
It's like The Path. It's good, it's art (or at least very "auteur"), but it's not much of a game.