I don't express myself at all in games. I play the most efficient way possible, and don't think about roleplaying or anything.
So I won't act the way I do in real life, but the way I act in the game is totally dependent on the situation.
Sounds about right.
So... you've never went on a killing rampage?
Not since I was ten, and tried killing a town in Ultima 1. (Of course, that was a top-down, eight-color game with a 280x192 resolution. It was 1980, after all.) Since then? Nah.
I tend to play "good". Have a hard time playing evil (which screwed up my plans to try a very different playthrough in FO:NV... I couldn't side with the Powder Gangers in the first town. And I'd certainly never be able to cooperate with the Legion.)
Oblivion.... never "rampaged" in a town. Across all my characters, I think I've only gotten credit for four "murders", three of them on one character. Either friendly fire accidents, or those slaves in the arena who somehow count as murders. Only seen Lucien spawn twice, killed him immediately both times. Generally don't "steal" anything either... only rare things (like that Nirnroot in the IC). Get plenty of loot from dungeons, enemies, and guilds I've joined.
Fallout 3, I feel a bit more open to doing "grey" things (like taking out the Family.) But I still never even think about nuking Megaton or working with the Slavers. Also more willing to steal "rare" supplies from people, at least in the beginning when you're short on ammo.
Packrat in games, packrat in real life. But I buy all the stuff I'm packratting IRL.