Can I steal from bad guys (opposed facations) without becoming evil? Meaning if I am playing a nice guy can I take stuff from my enemies and still stay good?

It's like Fallout 3 any place that is or was inhabited by people will have there stuffed marked in red

What is kind of annoying is Legionary though they are clearly "evil" but it's still bad to still from em?

Because the faction system in FO:NV will let you become "friendly" with even the evil groups, their stuff is marked as owned. And the ownership flags on items don't change as your faction reputations change.

So you can have negative Karma while being friendly with all the good factions? That seems odd.

Karma basicly is useless now.

And there is no evil or good, everything is grey.

Well, at least it's realistic.

Yeah, it's sorta weird to get good karma when killing some guy, then lose karma when you take the stuff in his chest.

But, karma isn't as important as rep with a faction, so it doesn't bug me much.

Just install the no karma for stealing mod....

I guess it makes sense, but I figured that after I befriend a faction, they wouldn't mind if I take all their useless Bent Tin Cans. Useless because they just leave them lying around so they obviously don't care, but useful to me because for some reason they're worth 1 cap