Having played the absolute shit out of all of them at launch, including the non canon ones, Fallout 2 is my favorite, followed by New Vegas and 76. 4 was fun, but I spent more time building bases in 4 than I did in the story.
I've probably put more hours in 76 (since beta) than 4 at this point, specifically because it's multiplayer, and Im pretty sure I had at least 400 hours in four.
His own words! "I'd finish the problem". Sweet merciful fuck that guy is mask off evil and still people decry harm reduction.