What film, show or game that is not necessarily 'underated' didn't have the level of social impact it deserved.
What's the antithesis of Arrested Development, Firefly or The Big Lebowski? Those may never have 'found their audience' but over time seemed to recognised by everyone. What are the deep cuts that you liked but it feels like everyone has completely forgotten they even existed.
The Good Place might just be my favorite TV show. It's just so well done on every level and is one of few sitcoms where the main characters aren't just terrible people. They're not perfect or anything, but it's just nice to see characters earnestly carrying for others and trying to be better people.
Parks and Rec is another show like that (also by Michael Schur) that I just love.