I adored Disco Elysium while playing it, but the ending felt kinda rushed/soured for me so it didn't quite hit top 3. However, the book Sacred And Terrible Air by Robert Kurvitz that was fan translated to English semi recently helped a great deal with unanswered questions about the world the game takes place in that I had which really helped brighten my overall opinion of the game in retrospect.

The book isn't very approachable I think with almost zero exposition, so it actually helps to have played the game first.