As part of Fallout turning 20 for 24 hours Fallout is free on Steam.
http://store.steampowered.com/app/38400/Fallout_A_Post_Nuclear_Role_Playing_Game/
http://store.steampowered.com/app/38400/Fallout_A_Post_Nuclear_Role_Playing_Game/
I know a lot of improvements Fallout 2 brought would definitely spoil you, but it's not like they a complete 180 of each other, like FO3 vs. NV did.Last time I played Fallout 1 was back in 2009. And I'm not gonna replay it until it's playable in the Fo2-engine