Yep Fallout 1 & 2 are classics. If you haven't played Planescape: Torment yet then thats something you should play at some point, if you like stories and can spend some time reading. One of the best games ever imo
I know JRPG's get some general negativity, but some of them have decent stories (but a ton of fighting too). FF7, FF9, FF10 etc. Just get an emulator and you can play them on your PC..ff7 has a pc version too (and 8, but I never really got into that one). Get an engine mod for 7 if you use the pc version and the use original PS sounds
Regarding adventures, I liked the Broken Sword series, and if you don't mind old graphics then get all the original Lucas Arts ones. The Telltale ones are OK, but I don't think episodic adventures are for me really. I like the old 2d style adventures. Theres some decent adventures around if you browse sites like AdventureGamers you will find plenty
For multiplayer, you could try GW2, League of Legends etc, Darkfall maybe (well wait for 2.0 then look into it). Fps games are kind of boring to me now. I picked up cs go which is alright I suppose. Can't stand modern popular fps games like cod..don't want Origin or any EA fps game tbh. So not much choice in terms of FPS's atm. Was hoping RO2 would spark my interest in FPS games again but that was very disappointing compared to Ostfront