Disco Elysium isn’t part of a series (and probably won’t ever be, super disappointing news there). Going in blind for that one is a good idea.
I don’t use the subscription services much but I did try a month of Xbox Game Pass a few months ago. Ended up being disappointed by Persona 5 Tactica and a little bit surprised by Dune: Spice Wars. The plot pacing felt undercooked in P5T and Spice Wars reminded me of a bit of the early 2000’s vibe for Dune games, probably a plus for some people. Ultimately it didn’t keep me interested for more than a few hours (4X games have a very high bar to clear for me). Also tried Hi-Fi Rush, but didn’t stick with it long even though it felt like a solid product.
Didn’t continue Game Pass because I’m kind of a mercurial player, bouncing from game to game. What I end up sticking with depends a lot on vibes and mood. The service wasn’t the best fit for me.