I know why people are kinda mad at this manga, but, and hear me out, this is obviously not doing anything seriously, the MC is OP, no questions asked and there's barely a doubt that he will win, mostly because he properly choses his next objective, we're not here because we want the typical adventure of an OP isekai protag, we're here for the slice of life of an old man partying up with essentially his daughters(and suposedly later: his younger but thankfully legal, waifu), I don't want to bother reading an infodump of a protag using dubious real world science to make low level magic super efficient and more powerful than anything hundreds of years of magical research could not, I just want the story to move along and watch the interactions.
that said, this gets a 7 from me, it's fine and entertaining, nothing groundbreaking, but I am not here for serious storytelling, nation building or MAXIMUM DRAMA!!!! Slice of life and headpats are enough to entertain me.
ps: no I am not forgiving the author for basically never explaining shit, it just doesn't bother me as much because every single isekai manga follows basically the same tropes so it's easy to fill most of the gaps(aside from never mentioning the isekai, that should have taken at least a bare-bones explanation)