I read a LOT of reviews about how the version originally released was broken to the level of being almost unplayable. The PS3 version was patched, but not the Xbox360 (so don't even think about getting this on X360 over PS3). Reviews stated that the patch made things good, and I will agree. The only issue I saw was in SH3 where the game might freeze for 1/10 to 1/4 of a second, but it never effected the game.
As for the games themselves, they actually were quite good. I personally didn't care for them, and my gut tells me that they won't be most people's favorite survival horror games. They just felt a little too heavy on the puzzle side of survival horror games. I truly enjoyed having the option to play the action and puzzle portions at differing difficulties in both games, which threw in real replayability. But, nothing made me jump like a Resident Evil, and action always felt to take a backseat. Even though action wasn't the primary focus, and the puzzles that were there were interesting, they didn't live up to what I like in puzzle games: all out in your face puzzles.
The stories are both off-kilter, but do raise some mature thoughts (death of a loved one, good vs evil, etc). There are also other alternate endings, where you can see a glimpse of the quirky side of Japanese culture.
It's rare that I'll rate a game highly because I see the quality in a game, even if I don't like it. If this series had a different balance that matched my tastes, I'd definitely say that this would be the rare game I'd buy. Since it didn't, I just played through each game a few times, and still am happy I rented the game.
If you've never tried Silent Hill and are curious, definitely get this game in your queue!
The fact that silent hill became a game spell terror in every corner. i had fun shooting brain dead nurse and stomping floor junky...awesome. i would love to play origin and 4 if it were able to play on PS3