I too liked Fall out I, and II immensly (cheap too $10-20). It is one of those underated game with cult status. You can tell this game is made with genuine love for the game by the designers. This game is somewhat similar to legendary pre-online RPG Ultima series.
Best parts of the games are:
-It has lot of cools guns (from lowly home made rifle to FN FAL (Full auto!), Jack Hamer shotgun , HK G11 and CAWS, and my favorite 9mm steyr AUG smg).
-For some reason all the pistols in post apocalyptic world uses 10 MM
!!!
-You can kill anything from Giant cock roach to innocent town children (you get 'child killer' label on your reputation, and Kharma drops dramatically).
-You can actually buy drug (called jet) and become 'addict'.
Funniest parts of the games are:
-When you click on the game object 'Guns and Bullet' magazine, it reads: "You learn nothing new, Nothing really helpful except for somewhat biased reviews." ( I think game designer was definitely into guns.)
-You can actually go to whore house and select between 5 different 'services' and waste money on it. Also you can get it on with other characters (same or opposite sex).
-After beating the game you can become a porn star at the porn studio, and appear on the movie 'PULL OUT, the post apocalyptal bigalow'.
Nothing is more satisfying than watching all four of the bad guys' upper tolsos ripped to pieces (with very realistic bullet impact/blood noise) with realistic preban rifle/machineguns.