As I have said before, I am still on the fence about this game. On one hand it has potential, but I haven't seen any good utilization of this potential so far. But that may be because the trailers are a mis-representation of the final product.
My biggest gripe with my game has to be the gameplay, or rather the lack of it. Think about how advanced gaming has gotten. Think of the variety of different ways we have seen stories told over the years and how these games have let players interact with these stories. Cage looked at all of this, and then thought that the best way to tell his story was through the use of quick-time events. This, from the look of things, have reduced all of the gameplay to an advanced version of Simon-says. The game looks like a movie that requires you to mash some buttons to progress the plot.
In my experience, quick-time events in cut scenes are very tedious the second time around as you already know what to expect. This could make slogging through the same cut-scenes feel very tedious on a second play through. You could argue that because the story changes based on the players actions that this isn't to big of a problem, but that in itself is a separate problem. I have seen little to indicate that the player will have a major impact on the game's story. So far the only interaction I have seen consists of choosing from a variety of different actions like in Mass Effect, but I haven't seen evidence to suggest that this has much impact on the ultimate outcome of each situation. If the player interactions arte really as weak as the trailers have suggested, then I feel that this game will be very poor because of it.
And another thing that bugs me, though not as much as the game's other issues, are the graphics. This is mostly in relation to the appearance of the characters. Sometimes they look fine, other times they just seem strange and stumble into he uncanny valley. This usually occurs when the camera closely focuses on a character's face, or in an action scene, for they show how clunky and unnatural many of the character animations look. Normally I wouldn't chastise a game for this, but considering the type of game Heavy Rain is trying to be then it will be a problem.
Though despite my skepticism I do hope that this will turn out great. I'd love to be proven wrong.
Note: Just so you know, by this point I have watched many trailers for the game. However, the trailer bellow showcases many of the issues I mentioned earlier.