This is in my oppinion, THE greatest RPG Series EVER made. Fallout and Fallout 2 are definatly two of my favourite games from any genre. Fallout tactics is fairly Meh - but fun for a while
The graphics are far from perfect as you would expect in games that are 10+ years old, but that is not what these games are about. Fallout and Fallout 2 are superb, original RPGS, where everything you do feels like it has an impact. There are many RPG games today such has Oblivion that simply cannot compare to the characters of this game, and the way you interact with the world, every action has a consequence.
The greatest thing about this game is you can be whom ever you want, inherantly noble - rushing around saving damsels in distress or terribly evil, yes you can hit a child in the groin with a sledge hammer.
The fallout games are very dark at times, and contain things that other games don't or can't, but contains masses of black comedy, wit, and some hilarious dialouge.
The game is MASSIVE and there is so much to do that without a detailed walkthrough there is so much you will miss, and catch a 2nd,3rd or 4th time of replaying. I have completed this game countless times and it still gives me new things that i missed before.
Hugely replayable, Hugely Immersing, and just darn right excellent. If your a fan of games you should at least give this a whirl.
One thing I will say is you need to patch up before playing, for example if you don't install the children patch - guess what? There are no children which reduces tonnes of quests and many things don't make sense (this is becase in the UK you can't have children in games you can kill :S - however in the US you can)