People think that things are "Dragon Ball like" that once an enemy is overcome, the main characters will just use them as a measure stick for mooks of the next baddie.
I always liked the times that Batman lost in the animated series, once when a random mook seemed like he killed batman, and then when he finally decided to give up the cowl in batman beyond. Them not being ninja gods, but real people with real bodies that would die if they slip in the shower or they let a bullet enter their chest is ok, them being lifeforms capable of reacting to anything, and rearanging their inner organs to protect from damage, or to always be a shadow clone is.. ok-ish, it is also kinda not about consistence (even tho it is nice) like characters being with their guard down outside battle, or just tired in consecutive missions, or underestimating/overestimating an enemy and adjusting their strategies accordingly, or conserving resources for later, or a lucky break out of the opponent.
It is about enjoyment of the situations they present, as if it was enjoyable, the nitpick wouldn't be the main theme of this conversation.
I'm sure it is terrible, but I'm just as sure that "power level" isn't the answer.