Dark Souls 2 has a really cool take on PVP. You can join covenants that guard a specific area and then defend it from invaders (other players trying to play through the game). They'll be trying to clear the area and you get to pop out of the shadows and stab them to death while they're busy fighting rats or zombies or whatever. As you go along you can upgrade the area to make it more difficult to navigate for invaders.
The hatemail I get on XBLA is phenomenal. I had a guy threaten to find where I lived.
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