So a movie that's popcorn-ish in its execution is merely a movie, a movie that sucks you in (Heavy Rain) and makes you feel like it's happening right now is an experience and therefore has different sets of values? (like how Heavy Rain fails to knock someone out with a blow on the table, while Nathan Drake wiggles off trains and gets shot by helicopters is apparently okay because it's a 'interactive movie'
Besides, the way you describe Mass Effect 2, that's exactly how Heavy Rain is. Both are bringing you from A to Z, where Z can be different depending on how you play the game and where things between A to Z are within your own control.