The biggest issue I have when replaying Fallout NV is that the FPS combat, which is of course a huge part of the game, isn't very good. It's not even just the feel of the gun-play either, the levels are not made with tight enough collision boxes for the shooting to be good. Like shooting through the rails of a stairway, but oh no, that's just one big block of collision, so your bullets just hit air.

Fallout 4 goes hard on survival mode plus mods to make stuff scarcer so you actually have to engage with the survival mechanics. i'll never get tired of picking over that lexington super-duper mart and getting swarmed by ghouls