I first played Heavy Rain as the Demo and really didn't like it. I thought it was slow and boring. After a while everyone was talking about it and saying how fantastic it was, so after seeing it on here for a good price I thought I'd give it another go - I'm glad I did. This is, easily, the best game I have ever played.
The storyline is brilliant. And with a HUGE twist in it. Really shocked me. Being able to play as different characters and see the story unfold from each of their point of views is a really cool element of the game, and the graphics are brilliant! And it's definitely not slow and boring - there's constantly something that you have to do, look at, or interact with.
Even if you get to the end of this game in one sitting, you'll always have to go back and replay levels as every single little decision you make alters something else later on in the game - so if you want to see all of the possible endings, and get every trophy, you'll be playing this game for hours and hours.
P.S - Here's a tip - DO NOT put your controller down at all unless you have paused the game!!! ;)