I also played Silent Hill and Silent Hill 3 and finished those games. Played 4 and Homecoming and kinda lost interest and never finish the game. Don't know about down pour but what I read at Gamespot http://asia.gamespot.com/silent-hill-downpour/
could be worth checking out
I beat the first silent hill, played 3/4 through silent hill the room, but then I got stuck and quit.