Try Oblivion, you can pretty much do whatever you want, you can help someone out and then steal them blind, you can throw your shoes on rooftops, and get a collection of dead bodies (at least for a while) I did the Murderer/Thief side, and havent even touched the main storyline(might have to so i can kill the king) from my understanding the main storyline is only about 20% of the content it's all the sidequests you can do that really make up the game. I even once murdered an entire town, except that the city gaurd just kept coming, and some named people don't die they just go unconcious. If you want to spend the time you can master pretty much all the skills in the game, so you can be everything all at once Healer,Stealthy, Fighter, Mage