The main problem with Dead Money is that they put too many limits on it.
You lose all your equipment and have to depend on the Holorifle (Kinda meh until you find all upgrades) and stuff you find around,
The vendors dont carry caps, so you have to trade stuff you find,
The colletables are way too hidden to find (Dean stashes, upgrade schematics, poker cards)
There are traps and clouds everywhere
THE FUCKING RADIOS THAT EXPLODE YOUR HEAD AND INVINCIBLE MURDER HOLOGRAMS
You need high speech to get the best ending (85)
The gold bars 'reward' is way too heavy to move and too expensive for vendors
You need to win the limit at the casino to get the special token
Cosmic Knives are limited
The Ghost people gimmick ends too fast, since Dog teaches you how to keep them down when you find him
You cant return after you are done, unless you noclip or uses teleport commands