1: Fallout 2
2: Fallout 1
3: Fallout Tactics
4: Fallout 3
Fallout 2 doesnt just win the "best" of the fallout series for me... It is actually my favourite game of all time.
It has a few bugs, it`s a little quirky, but for replayability , for fun, for great stories and characters, its just wonderful.
Fallout 1 is excellent too,
Tactics is more intense and driven, less humour, more "business"
Fallout 3 is only last because it isnt really a Fallout game, it really is just a 1st person shooter grafted into the Fallout environment... BUT....
Its stunningly beautiful.
To don my sexism cap briefly -
Fallout 2 is the one I would marry..for life
Fallout 3 is the brief Holiday fling you have with the stunningly beautiful foreign lady you cant believe said "yes" when you ask for her hotel room number.