I might as well add my two cents, sorry for the necro.
Personally? I love Dead Money for it's characters, atmosphere and writing.
And after playing it recently I would argue there is only one area I despise, the damn vault.
Previous areas were spaced out, had dead zones for speakers and were fairly easy to notice. It was challenging, but fun.
However, the vault itself was terrible. Between speakers being horribly spaced out and three holograms guarding the final area it was annoying more than anything else.
In fact, I would argue that this DLC makes Implant GRX invaluable. I tried playing it without it and the window of time you have got in the final zone is too small.
There are no computers you can hack, no wires, nothing. There is only a sequence of events that you must do to survive.
Other than that, the dlc is great.