I played through Fallout 1 recently under the Fixt patch (I already had the first game for free during the anniversary sale a while back). It was fun in the sense of immersion. In the modern need for an FPS shooter and 3D graphics, modern players would quickly get frustrated or bored. The game, its story, setting, and themes were made in a different period of gaming. Its writing still amazes me despite its engine and time limitations. With it being a great game, it's balanced with noticeable flaws. I'd say its weakest area has to be the Boneyard. the twist of the gang being Good Guys was meh. Some quests were not implemented on time, which caused some issues that the patch later fixed. Also, building space was questionable, but considering the game had to be run on Dos, too, technical limitations can be a bitch. Arcanum also suffers that issue with its Fallout cousin.
If Bethesda didn't have the IP rights to it, I'd wish for a modern Fallout 1 remake but still in the game's art design style. It felt more like Metropolis gone wrong than a 1950s Americana Renaissance before the Great War. With the right team, players would get immersed in Necropolis' puzzling streets, the scraped skyscrapers of the Boneyard, the smog of Junktown, and the nocturnal lights emitted from the Glow. So much potential with this series, yet the series suffers the same issue as Sonic the Hedgehog: Its fans are fucking insufferable.
