So Meclar, you're looking for something to play where you don't necessarily have to play for long stretches to get into, don't need a state-of-the-art system, and don't need to be fully focused to play decent?
Have you tried any Saints Row games?
RPG's specifically might be tough in that criteria, but if you like ARPG's (like Baldur's Gate or Diablo), Grim Dawn and Victor Vran are both very good choices and have great single player. There's also multiplayer for Grim Dawn, I can't remember if Victor Vran does, but I think not. Path of Exile is always my top recommendation but that has a huge learning curve, and an overwhelming amount of content, requires focus, and consumes an endless amount of time, it's also always online. You can play "single player," but still online.
Otherwise Middle Earth: Shadow of Mordor is a good choice too, but requires some decent specs.
Terraria, Craft the World, and Subnautica are also good choices of games you can pick up when you want to play, make progress and have fun, and then put down when you need to stop.
