Personally I never really gotten into Bioshock though I have owned it twice, once on Xbox 360 and currently on PS3, I have never gotten into the characters, story or atmosphere. When I originally played it on Xbox 360 what ruined it for me was the gunplay which I, personally, felt didnt have a good feel to it and seemed to make up most of the 'gameplay' (although I know the story is what people remember) so I didnt enjoy playing the game. I ended up trading in the game but remembering all the praise that was given to it, and still is, I decided to rebuy it when I saw the Ps3 version going for cheap. Im trying to play more of the game to get to the twist that people keep saying exists, and im actually looking forward to that moment, but what is ruining it for me even more than the weak-feeling gunplay is that I have to use the "R2" button to fire. This is a relatively small flaw but I dont enjoy using "R2" to fire, in general I dont like using the button but it has its uses but for me firing a gun is not one of those uses.
So for me using R2 to fire in Bioshock, or in fact any PS3 game, is making it really hard for me to enjoy playing the game (I wish I had the option of using R1).
What small flaw's have ruined, or perhaps just seriously dulled, a game for you?