The biggest surprise is nothing for Kaitlin Olson. She more than holds her own against the rest of the crew and manages to effortlessly swing wildly between bliss and rage. Olson plays the character so well that you're always rooting for her even though you know she's probably going to fall on her face and take an endless amount of shit from the others. It's hilarious and depressing at the same time.
the introduction, mid series, of a huge Hollywood a-lister looks like Poochie 101 on paper but Frank ended up being the most amazingly counterintuitively brilliant decision in the history of TV.
obviously DeVito is a genius anyway but he went to the show from pure passion and love and rather than distort or outshine their talent he became this incredible pressure valve to let them ratchet up the show to heights it may never otherwise have reached and it was already one of the best shows on TV.
the fact that these profoundly evil agents of chaos and selfishness could be humanized or amplified by this newcomer was eye opening.
And if there's any justice the Emmies will fix it for the final season. It won't be a consolation prize it'll be an admission of prior failure and a deserved apology.