Fallout 1/2 are excellent games even by objective modern standards.
While the UI is a bit archaic by modern standards, it gets the job done. Late 90s UI/UX was noticeable better than what RPG games offered in the early and mid 90s.
Some elements of the gameplay are also subpar in hindsight. I find I have to cheese a lot of the early game combat encounters and get in pretty tedious kiting sessions (and even save scumming).
I bought Fallout 3 on release, but I bounced off it after a few hours of play. I've been meaning to replay it, but just haven't gotten to it. New Vegas (technical glitches and limitations aside) is a whole different story though.
Fallout 3 kinda overdid the grays and greens in its art style. It works for a post-apocalyptic wasteland of course, but everything starts to look same-y after a while. Especially in DC itself with its nightmarish metro system full of identical gray metal infrastructure.
I just finished replaying Fallout 1 and I liked it. Sure the UI is clunky (especially the inventory management), but the story is pretty good. Of course it could be the rose-tinted glasses, but I tried to play other games from my childhood - Dune 2, Civilization 1, Alpha Centauri and I couldn't, those games are too dated for my liking.
For anyone interested in Van Buren there's a huge rabbit hole you can go down. The demo is available, there's several fan projects made to recreate elements of it (more than the one the article mentions), and Retcon Raider has some pretty good videos covering the design documents.