I incidentally just finished Dead Money yesterday on my new character, and even though I loved it, I have to admit that it has some ridiculous difficulty-spikes, especially for a non-sneaky character build. Even worse, the DLC do have some REALLY annoying parts to it, like the goddamn loud-speakers that make your head explode, or the hologram-guards that can take you down in three or four lucky shots (and the only way you can get rid of some of those guys is by finding their tiny little emitters hidden on the map). So yeah, that DLC was a little rough around the edges, but otherwise it was pretty damn well written and a different experience from the rest of the game, so I am not complaining that much.