Yeah I think saying it's a must have for any gamer is a bit too much, no game is for literally everyone. Disco Elysium's humor doesn't strike me as overly humorous anyway, it's not really a comedic game, more of a dry chuckle now and then.
And the fun is really just reading/hearing any of the dialogue or descriptions, it is very well written. You get a lot of different choices depending on the "build" stuff, but it's really mostly all well written and should be enjoyable if you're into the style at all