what s/he said.revolutionaification said:I'm full Paragon, baby!
Seriously though, I tend to play way too nice unless I have a specific goal in mind that requires me to be an asshole to someone. Even then I usually try to be as nice as possible, stealthing over stabbing and all that.
At least on my first playthrough.
My second tends to be a little less perfect, investigating what happens if I punch so and so instead of giving her a backrub. I start to see if moral choices actually make much difference.
And then I always go and create an uber-dick, designed to be as offensive as possible and used purely for messing around in game. Very occasionally, and I mean VERY, will I take one of my 'evil' characters seriously, and even then they tend not to open fire on sight. For example, my Fallout 3 girly, Levi is a smooth-talking assassin who'll try and charm her way into or out of things but won't hesitate to repaint the place with your brains should you cross her.
Yeah, I'm pretty boring.