I was surprised by how much I enjoyed this!  Liane Moriarty's sense of humor is a lot like her sister Jaclyn's, whose YA & middle grade books I've really enjoyed, but this is definitely an adult novel about Adults Behaving Badly.  Also, having been a kindergarten parent twice now, I can assure you that the amount of weird social politics and hurt feelings and upset about birthday parties and such is not exaggerated *at all*.