To me it is almost never happened that I had to fremdschämen for characters in series. Scenes in which characters run repeatedly against glass panes and have still not understood it at 5 times, or places where apparently lead one little raisin to almost complete loss of hearing in both ears of Winston, are just a few examples. The behavior of the characters, I feel mostly not as funny but rather as completely brainless.
The problem I see is that there are enough serious points which -Do not fit the "I'm so stupid like a toast." There are quite movies or series, which get away with such a stitch (Monty Python, Mel Brooks ...), but here the story is consistent. The change in New Girl between normal behavior and this kindergarten will change more often than Kim Kardashian her lipstick.
I feel Schmidt and Cece doing so than the most pleasant characters, here you have to regularly chuckle or can even create a certain empathy in the context. The remaining characters may be missing simply, this would not even bother me. This is however by no means to the actors, but I think just the script.