Absolutely, there are some absolute classics in the series. It basically takes place in an alternate history America that's somehow further into the future than we are... but the 50s culture never really went away & microcomputing never took off. The US and China have a war that lasts a few minutes as the world is nuked to hell... and each game starts off with you several hundred years away from that war in the post-nuclear armageddon world that emerged from the aftermath.
Fallout 1 and 2 are very different to the newer Fallouts. It's one of those isometric 3D RPGs, so you've got a top down view of your character. The games are dated, but they are really fun & have good stories & better RPG elements than a lot of RPG games out there. But if you haven't played those old 90s isometric games before... I think it can be a bit of a struggle to enjoy.
Fallout 3 is after Bethesda bought the series & is kind of the modern rebirth of the Fallout games. Idk if you've played any of the Elder Scrolls games... but they've basically made Fallout in a similar way to those games. Fallout 3 is brilliant - but also very dated... the shooting mechanics are clunky as fuck. It makes you appreciate using Fallouts VATS system rather than the traditional way of shooting people in a video game. Fallout New Vegas is even better (and made by the same people that did Fallouts 1 and 2 + that Outer Worlds game I talked about & the Wasteland Series... plus another RPG that is very popular that I can't remember the name of - I'd argue they're the best RPG developers in the US) - it's notoriously buggy though (there's a mod that basically patches it lol) and it's got the same similar clunkiness issues of 3.
But they're excellent games with excellent stories. Fallout New Vegas is absolutely fantastic tbh. And while they are really dated, they've been out for a while and have a huge modding community. So you can sort of modify the game by installing a few mods. In my experience though, too many mods at once can absolutely break the game.
Fallout 4 is a further modernisation... although they sort of shat on the RPG element of the game to make it a bit more accessible to the masses, so some of the choices you have don't have the same kind of consequences or variety that the other games provided. Where it makes up for it though is the gunplay no longer feels like absolute dogshit to anyone that's played any sort of modern shooter at all. It's not so dependent on VATS (although I still used it constantly). Don't worry about what VATS is - they'll explain that to you when you start playing one of them. They added some shit I absolutely do not care for - like the crafting and settlement building.
Fallout 76 is shite though, online only and sort of their take on World of Warcraft.
All in all though, very enjoyable games - I'd highly recommend them.