The cast in this show helps elevate it above other sitcoms (but not You're the Worst).
The writing itself could be acted in many ways, changing the tone of a story entirely. The dryness the two main characters use make the show great. The cynicism is very evident, and it makes the whole show very funny. Point is, it's really good.
Just watch it. Best episode: "The Playdate" This episode just proved that the delivery REALLY helps, everything is done in a fully dry, cynical, and unemotional manner that emphasizes the ridiculousness of it all, or it is very emotional, proving that these characters are real people and can convey emotion.