The cat I grew up with had a very relaxed attiitude towards people. She would come over to say hi and get petted (whether or not you were a stranger), and wander off to go kill things or sleep. You could play with her if she felt like it. She'd pounce on your hands if you were gardening.

That's the general attitude I see in outdoor cats. Some are more skittish, some are more friendly. But then indoor cats... man, I don't know. They usually freak the hell out when they see someone new, they bite and scratch randomly while you're petting them...

Anyway, that's my experience. It's not a perfect correlation by any means, and I'm happy to agree that it might be a selection bias or something, but the general impression I have is that indoor cats are weird. *shrug*