These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Is Natsuru truly a dense brain-dead idiot towards the women in his Unwanted Harem not named Sakura?, or has Sakura been influencing him to the point of Natsuru only caring for her and not the other girls who have been trying to impress him? The final few episodes where Sakura starts to genuinely brainwash him can make a valid case of the later.
Moral Event Horizon: The Moderators as a whole cross this with the revelation that defeated Kämpfers are turned into Unpersons, meaning Kaede had already crossed the MEH just by her affiliation with the Moderators even before said affiliation was revealed at the end of episode 10.
They Wasted a Perfectly Good Plot: The initial story about the Kampfer's is actually a rather interesting story and it presents a lot of moral issues in-universe for some characters. However, the show just sorta abandons any real impact of that in favor of a Ecchi Slice of Life comedy, and when it does give some focus to the actual Kampfer storyline, it quickly reverts back to the comedy romance. Its one of the major reasons the series is so disliked.
Also, the fact that the entire plot is one big Clingy Jealous Girl fight (with the occasional Manipulative Bastard Shizuku moment) got about as predictable as the morning sun. Hell, even the minor characters are only interested in getting Natsuru naked.