Kotaku reports on Stephen Totilo’s experience with an incomplete, pre-release build of French developer Quantic Dream’s upcoming Heavy Rain, a PS3 exclusive that lots of people are watching, not only as one of the games that really leverage the inherent power of the PS3, but also as one of those exclusives that might tip the scales in Sony’s favor for the first time this generation. Totilo’s reactions weren’t entirely positive, though; and it’s not surprising …