First season through season 4 is good. Looses it energy and feel, in season five and six. Chevy Chase and Donald Glover, Yvette Nicole Brown were good additions and are noticeably missed. Why Jillian Jacob's character becomes ignorant is unknown. Paget Brewster is good addition along with Keith David becoming part of the cast. Ken jeong changes his character through the seasons and doesn't seem to fit. Danny Pudi , his character stays steady which works. Joel McHale, Jim Hash, Alison Brie, characters don't change and perhaps kept the interest.