Just finished the first New Vegas DLC, Dead Money... and I'm completely blown away by it. This is better than anything they put out for Fallout 3. Here's a few quick thoughts...
-It's got a great, engaging story (featuring a character mentioned in the main game, Elijah) that has a lot of interesting backstory to pick up if you look around the area. Won't give any plot spoilers but this is better writing than most of the main game. Pick it up, if only for the story.
- I'd say this is a 6 hour DLC at minimum, though I think I spent more like 10-12 doing it. Lots of value here.
- Fully fleshed out and engaging character NPCs, each with a special ability that can REALLY help out in the Sierra Madrea. Each character has their own storyline in the DLC which unfolds naturally over the story and isn't a forgone conclusion like the Fallout 3 DLCs.
- Very atmospheric and scary environment, with traps and poisonous gas clouds every. The enemies are nearly silent and strike from out of nowhere... and they don't stay down when you kill them (unless you REALLY kill them).
- The tone of the DLC completely changes the way the game plays. Your a prisoner and you have to do what your told or you will die... as will everyone else under the madman's control. You have no idea who you can trust. You will have to scrounge up casino chips and weapons if you want to survive (and this NEVER gets easier). Broken radios and speakers will trigger your collar and blow you up. Poisonous clouds envelop damn near everything, blocking your path. Worse, previous prisoners and the local population have left traps EVERYWHERE to kill you. Dead Money really throws you to the wolves and it never lets up until after your done.
- Lots of great, new items. The Cosmic Knife (think Ginsu Knives) and all it's variants are very powerful melee weapons, the Automatic Rifle is a fun way to use up your sniper ammo, Gas bombs are fiery death with lots of explosives skill and/or Pyromaniac, and the Holorifle does a damage type no one resists in the game (though you need to upgrade it to make it useful). The Sierra Madrea Martini is a powerful, useful, cheap healing item as well.
- This is my favorite part: They actually talk about the upcoming DLCs IN THE GAME. First off is The Big Empty, which looks like it'll be a scavenger hunt in a high tech wasteland. After that is The Divide... which sounds like it's going to be a post game DLC involving a war with forces east of New Vegas, which are being lead by another Mojave Courier (perhaps the one mentioned by Mr. Nash in Primm? He talks about The Divide too!). Coupled with the mentioned Lonesome Road (Route 50, which stretches from California to Washington, DC), which is likely to concern Fallout 3 crossovers, I think we have all the future DLC accounted for.
I highly recommend getting this DLC if you have the 360 version, despite the bugs New Vegas currently has. It's awesome and well worth the 800 points/$10 cost.