I’m currently re-watching all 9 seasons of The X-Files in preparation for the new mini-series coming in January.
I think the X-Files suffered back in the day because of the rigid 24 episodes per season network TV format, and the fact that if you missed an episode you didn’t have an F-ing clue what was happening. But being able to binge watch on Netflix, it really holds up (and I’m skipping the weaker episodes to save time).
I’m on season 7 now. The filler episodes are getting worse but the mythology is really heating up and there are still a handful of great one-off episodes (eg ‘X-Cops’ written by Breaking bad creator Vince Gilligan).