comments At Cobra Kai, students learn The Way of the Fist, a karate style described in the dojo's motto of "Strike First, Strike Hard, No Mercy." In the latest episodes of "Cobra Kai" viewers learn the way of third season mediocrity and the merciless lesson of nostalgia's diminishing returns. Advertisement: As with many TV shows, these latest episodes of "Cobra Kai" are as worthwhile a viewing experience as you deem them be — and yes, that is faint praise. It's also a painful admission on the part of someone who adored the first season of the show and applauded the raucous, operatic escalations of the second, only to walk away from the third thinking…