Because it nails the formula for mixing mirth and murder. The vibe of Barney Miller is in the air.
Because I really love these characters, and the performers are excellent.
Because the comedy is largely driven by the characters.
Because the non-funny parts of the scripts are clever, like a detective drama, with skillful misdirection frequently leading to satisfying conclusions.
Because who would ever suspect that the pairing of Andy Samberg and Andre Braugher would be so perfect? [8.55]