I enjoyed 1-2 but not as much as Tactics which in my opinion would be the second best Fallout game.
Fallout 3 sucked for me because I was a PlayStation user, crashes left right and centre, terrible story, alright DLCs and boring gameplay.
Fallout NV suffered from the boring gameplay as well but had a much better story, better DLCs (yes, even dead money was pretty good) and a more interesting world in general. NV is my favourite Fallout.
FO4 sucked dick.