You are speaking nothing but the truth, i blame this was arc for it, kishi only sped through it without enough effort to make them bad ass.
They are supposed to be the seven ninja SWORDSMEN, i was expecting badass swordplay and some jaw dropping techniques, but again Kishi and his lazy ass decided it was better to make them fodder. But lets just look at the bright side, edos are never full power, so that means that the swordsmen were far stronger than their edo incarnations, that is at least my take on it.