How bad are this season’s new sitcoms? How good are they? Tuesday night, Fox does the service of answering both questions within one convenient programming block. At 8 p.m. ET, Dads is the new season at its worst: dated, cheaply provocative, and laboriously unfunny. At 8:30, Brooklyn Nine-Nine is easily the fall’s strongest comedy pilot, clever, appealing, feeling thought-through and lived in after only a half-hour.