Fallout 1/2 are classics for a reason, they are amazing games. They have aged but still hold a lot of charm. Personally, i enjoy the turn based combat over the FPSish combat mechanics of the new ones. Critical hits are far more rewarding in FO1/2 then in FO3/NV and there is nothing quite like the old mini gun. I'd say go for it, they are definitely worth 5 bucks whether you enjoy them or not. You are more likely to enjoy them if you prefer story and humour over shooting things and pretty graphics though. The generalization that people who like FO1/2 don't like FO3 and vice versa is for that reason imo, the story of FO3 was pretty awful in comparison.
If nothing else, get FO1 and dress all snazy like.
If nothing else, get FO1 and dress all snazy like.