Gas Bandit's post in What Are You Playing made me think of this. What is the single most important mod you've ever installed. The one that improved or changed the game so drastically, be it gameplay, graphics, music, whatever, that you could never imagine playing that game without it.
I thought about some Skyrim/Oblivion/Morrowind mods I've used over the years and realized just how they're more about the mass modding than one single important one. Other than mod compilations which just incorporate a ton of other people's mods together, you're not going to fundamentally change one of those games with just one.
The one I would pick would be the Kung Fu mod for Max Payne. It looks cheesy now, but made Max Payne an entirely different game and I had a stupid amount of fun with it.
I thought about some Skyrim/Oblivion/Morrowind mods I've used over the years and realized just how they're more about the mass modding than one single important one. Other than mod compilations which just incorporate a ton of other people's mods together, you're not going to fundamentally change one of those games with just one.
The one I would pick would be the Kung Fu mod for Max Payne. It looks cheesy now, but made Max Payne an entirely different game and I had a stupid amount of fun with it.