I dont know why this got greenlit at all honestly, unless the 3rd season is supposed to be really good. The show spent the whole season introducing bland characters and building up new drama which we barely even get a glimpse of in this one.

As for the actual plot of this season, nothing of consequence really happens story-wise with the main character going through the easiest and most anticlimactic final fight I've seen in a while. The results are again anticlimactic

Spoiler, click to view

since the main antagonist literally escapes after failing to kill or hurt a single member of the main cast.

(basically nothing happens to any of the characters).

The season also contained a sub-plot where a minor character from the first season gets jealous of MC for being so overpowered that he gets rid of all conflict from the story. He then proceeds to get killed quite unceremoniously by one of the girls, not nearly warranting the amount of screen time they gave him.

This brings me to my main criticism for the show, being that it generally lacks any redeeming qualities or distinctions from the sea of other isekais we've seen so far. After season 1, mc became so ridiculously strong that all the fights feel like him taking out the trash instead of being actually tense.
The show also completely lacks any comedy which could compensate for this.
The setting itself also fails to be unique enough to pique the audience's interest, with what seems to be a very basic magic system, set in your typical video game medieval times. Either this was written as a very early entry into the isekai scene or it purposefully avoids adding any unique features to its world.

If I had to say something nice about the show, Its that

Spoiler, click to view

hiroaki's

time on screen was slightly more interesting than average. They set him up to be just another cocky asshole to be put in his place by mr overpowered, however he turns out to be an ok guy.

That said, the author tends to fumble every other character from the previous season as well. At multiple points the girls have to tell MC "I can be useful to you, I'm always by your side" and then they proceed to be wholly uninvolved in the fights which MC takes part in. During the climax the author tries to remedy this by

Spoiler, click to view

setting them aside from the main battle to kill nameless cannon fodder, while MC chases the villain.

The girls basically just all love him, its a harem besides the funny hyjinks. Except following the theme of utter blandness in this show, the girls have nearly the same personality and never disagree with anything MC does. They never really act up or do anything that god forbid, adds conflict to the story.

This season could have been done as a set of flashbacks in the 3rd season and it wouldn't have even been jarring.