I'm at a bit of a loss as to what to think about Heavy Rain. I'm not really sure what to think when the review says things like "You can't ever actually fail in Heavy Rain. There is no Game Over screen, and nothing will force you to have to replay anything" and "Heavy Rain’s an interactive movie, and it’s an enthralling experience."
I'm fairly certain that it is an entertaining experience and probably quite enjoyable, but I have some issues when thinking about it being called a game. If they simply called it an interactive movie (or a digital choose your own adventure), I'd have no problem at all, but when it's impossible to lose and all the gameplay consists of QTEs, I think it lacks some of the basic elements that make up a game (like coherent rules and the possibility of failure.)
That said, I did love me some Dragon's Lair back in the day (though you could lose in Dragon's Lair) so if I had a PS3 I'd probably buy it once it was down to $20 or less (because $60 for an 8 hour game that apparently is essentially the same for the first 3/4ths regardless of what you do is far too expensive in my mind) but it doesn't strike me as a system seller.