I would say, but that's just my opinion, the big difference is that Fallout New Vegas is already a great game without any mods. It can stand very well on its own. You can not say the same about most Bethesda titles these days. They need tons of mods to be enjoyable in the first place, where as in New Vegas mods are just the icing on the cake. This means that yes, even if they both have the same issues in some areas, I am more forgiving to NV, simply because the game for it self, is not insulting my intelligence as player.