Fallout: New Vegas is my first, favorite, and currently only game I've played. I do actually own every FO game, thank you Steam collection sales.
I have nearly 200 hours on New Vegas over the last 4-5 years. I first played it on console on PS3, courtesy of a friend giving it to me. Then I realized that I was missing out on the PC experience and needlessly suffering from the unoptimized mess that was the console version. So I spent almost a month on my first PC playthrough.
Then suddenly, mods. I learned the glory of mods through the Mod Nexus site, went fairly overboard on installing mods, which finally led to a giant mess that I just deleted. So after a short hiatus, I have refurbished my mod list to be much more manageable and not as game breaking or tangential - ALL THE NEW AREAS AND QUESTS.
Thus I am on I believe my 4th new game walkthrough of New Vegas, and have yet to finish the actual storyline. Time and other factors have really slowed my progression. So likewise, the FO Shelter game is a simply fun and quick game to play while on the down low.