WARNING: Spoiler in review.
People will try to argue that Heavy Rain is important for video games - that it matures the form of entertainment by providing a story above the level we're used to from developers. Trying and failing might be better than never trying at all - but that still doesn't make it anything other than a failure. When the game ends and the implausible happens - the fairy tale ending occurs - you will fully understand that Heavy Rain is child's play fiction, not a mature interactive film noir. Heavy Rain is important for video games - but only because it highlights how immature they can be as a medium.