Might as well watch Abridged alongside it, they're basically the same show from two angles.
But yeah, stuff in that vein is basically all haremshit LN-derived series, because that sort of scenario is very, very difficult to do right (mainly finding a way around the lack of conflict which a painfully overpowered protagonist creates--one solution is exemplified by The Games We Play, where the author balances their OP protagonist with terrifyingly more powerful antagonists; the other is to design the plot such that the protagonist's power isn't relevant: if they're an unbeatable combat monster, make everything around social conflicts and emotional problems which can't be punched into submission --so pretty much all of the examples are wanky self-inserts. OPM and Overlord are pretty much the only recent ones that are even half-decent. Akagi is close enough to the concept that I'll second it.
Somewhat amusingly, Mahou Sensei Negima is pretty much a perfect subversion of all the OP SI haremshit series that are cropping up now. Follow the checklist of points which it doesn't play in the normal manner.
1. Male protagonist in a strange situation which leaves him living with and around an abnormal number of girls, many of whom are attracted to him. But Negi is too young to be romantically inclined towards any of them, is in that situation based on his own merit rather than being The Chosen OneTM, and most of the girls are attracted to him as a mascot/human puppy rather than a love interest.
2. Protagonist is a (magical) prodigy who is unusually talented for his age. But he grows into the vast majority of that power through honest effort under the guidance and tutelage of adult peers, rather than luck or plot devices.
3. Protagonist becomes obscenely powerful in a relatively short period of time. But the setting is full of absurdly broken powerhouses, at least one or two of whom remain more powerful than him for the rest of his life.
4. The harem plot is never adequately resolved and endlessly teased. But the girls involved in it are all meaningful characters with their own motives and interests outside of the relationship, and the harem plot itself quickly takes a back seat to the real plot.
I could go on, but this is almost alarming. It's positively eerie, as if Akamatsu was intentionally subverting a trend that emerged nearly a decade after he started publishing MSN in addition to pulling one over the people pressuring him to write another Love Hina and writing a shonen action adventure instead.