you have perks and stuff, since bloody mess and mysterious stranger were still with me, but all in all the DLC is probably not worth it. The equipment you get at the end all sucks, and apparently you get a perk if you collect all the intel, but I got only 9, so forget that. It's pretty much running down a linear path and shooting people. At first it is neat since you can fire your gun like crazy without worrying about the condition, and the events taking place are pretty cool if you followed the story through the main campaign, but in the end it's just a few hours of gunning down chinese, then picking up a bunch of so-so equipment.
Still, it was cool to see the events that led up to the wasteland. It's a lot of the minor things like seeing turrets called "Mark I" instead of the higher numbered ones you're used to. Problem is that you have to pay for it all, I do feel a bit ripped off.
oh, and actually the sword is a bit cool since it's basically the Alien Blaster if it was a sword and had a dash attack.