Actually you have to find clues in Heavy Rain to move the investigation forward and conversations and how you handle them determin how the story unfolds. I get it, you played Lucas Arts' point and click adventure games and you think that is the best ones. I get it. Doesn't mean those are the only ones.
Parts of Heavy Rain remind me of games like Tex Murphy series. The game is about searching, exploring and finding new pieces to a puzzle. If that is not what a point and click adventure game is about, then cool. I guess we played them different.
I remember Tex Murphy... But to me that was also just trying to be an interactive movie. I mean wasnt it like, live action actors? (i think)
When I think of a point and click adventure, I think of Monkey Island, Grimm Fandango, Simon the Sorcerer, Leasure Suit Larry, Sam and Max or Broken Sword.
The 'first person' feeling ones were never my bag, and rarely actually good... bar Zork and maybe Myst... if your into that kind of thing.