I played a massive amount of Fallout New Vegas on Steam, and it was the game that brought me back to try Fallout a second time after the awful Fallout 3 turned me away from it for 3 years (haha, funny). This game is still the best 3D Fallout ever made, even in spite of how little time Obsidian was given. With a more sensibly written main narrative, the return of the tone and humor of the OG games, and far more content and features that make this the best Fallout RPG you'll find. Also make sure to get this version, as it feels far better than the Steam version. Just throwing it out there.
