Fallout 1
You will hate this game on the first and second playthrough, and you likely won't finish it on your first try. But you'll find that once you get your grove the game is hard to put down. Like every fallout game it can be abused, but FO1&2 have a much harder learning curve and expect you to pay attention. If you are struggling pick GIFTED as one of your traits. Don't take Energy Weapons or Big Guns for tag skills. ALWAYS take a high agility special (at least 8 ). Despite its issues its still a great game and has aged better than most. oh, and DO NOT SAVE DURING COMBAT UNDER ANY CIRCUMSTANCES, YOU WILL BRICK YOUR SAVE!
Fallout 2
All of the above applies here as well. Basically a Fallout 1 mod. Much more complex and harder than Fallout 1. Unlike in FO1, you will go without a gun for a good while, so maybe think about tagging Unarmed or Melee Weapons instead of Small Guns. This game has the most companions and is at its best when you play into its post-apocalyptic road trip with all your buddies, so take a high Charisma stat if possible. Way longer than Fallout 1 but also more bloated because of it.