Of course I wouldn't have put in so many hours if it was just the vanilla game, its thanks to the many great mods the community has come out with that has made my time in the game a delight to play every playthrough. I've only put more hours into Team Fortress 2 and WoW back during the Vanilla days, and I can easily see New Vegas surpassing those games within the next 2 years. Yeah, over 800 hours in a single-player game, how could it not be my GOAT.