Maybe I just have stockholm syndrome, but I genuinely love Dead Money's gameplay. I have played it 10+ times, even on my Very Hard/Hardcore Permadeath run.
I disliked Dead Money somewhat at first, but a few successive runs and a few years kinda made it grow on me. Even if it’s mechanically kind of rough, it was still more memorable to me than - say - Mothership Zeta from Fo3 or most of Oblivion’s DLC.