Original Bioshock. I rented it and didn't like i. Some time later I decide to give it another shot and found out why everyone was praising the game.
*Edit*
I also forgot to add BFBC2 Multiplayer. Played through the single player and enjoyed it then jumped online and couldn't get into it. Decided to buy it cheap one day and fell in love with it. Found out why it was much better than post Cod4 games. Still don't like BF3 Multiplayer though.







