This question is directed at people who played the old games when they came out the first time. It's not important how much you liked these games. What is important is you completed most part of the games. If you played Fallout1 and Fallout2 after you played Fallout3, please state this.
But please do not leave sorry played out excuses like "but Fallout 1 and 2 were old!". Or Fallout 1+2 fights being turn based and Fallout 3 being realtime. Or Fallout 1+2 being third person and Fallout 3 being both 1st and 3rd person.
As these things depend on taste rather than facts. I may like games that are good and you may like games that are worse.
Write about things that are better (even if the difference is marginal) in Fallout 1 and 2. Compare the role playing aspects, game mechanics, the matureness level. Give examples and compare them. Hide the spoilers about Fallout 1and 2 if necessary. And write about things that doesn't not can't don't come to my mind write now.
Hard request considering how extremly different they are (1+2 vs.3).
-Dialouge/Quest solutions. You did not need to pull the trigger (or use whatever weapon) to have an exiting playtrough in nearly all quests of FO1 and a lot of quests in FO2 IF you char was played/skilled in that direction. Sneak/Lie/Fasttalk/Impress/Seduce/Bribe to get stuff done. FO1 even had a textbox in which you could type stuff to ask for which does not appear in the choicebox.
-Trueest to P&P RPG adaption I ever saw. EVERYTHING you did depended on the skills of you char and how you developed him/her and you never felt punished for choosing skill y instead of skill x since x helped you solve the same problem in a total different way (or rewarded you with something else with a similar worth) as would y have done. Two playtroughs in FO1 or 2 could be totally different from each other in everything you do and the reactions towards it while two in FO3 are mostly the same.
Just a minor spoiler example (my fave) from FO1.
The daughter of a village chief got captured by raiders. You could do the following ragarding the development of you char (just what I remember)
>you go in gun blazing, kill them all.
>you could challange the leader in the boxing ring.
>you tell him how dangerous you are and that he don't want the trouble.
>you sneak in though the back door.
>or you just join his gang by showing him how badass evil you are.
-huge scale / world map. It gave the whole thing a big feeling of the emptyness of the wasteland. FO3 put it all together in one city + loose surroundings which gave it a quite crowded feeling.
With these points I'm not telling that I dislike FO3 (I love it) compared to the first two. They are just too different for me to do that.