While not wanting to excuse the relentless undermining of alien threat that is a key part of any ST incarnation, it strikes me that these are shit Klingons, and not wholely accidentally. T'Kuvma was the visionary prophet uniting a dissolute race, and Voq his designated successor: these opportunists clowns are the usurpers of this legacy, it wouldn't make as much dramatic sense if they were capable and competent anyway.