This is another series like Kenja no Mago, where the plot is kind meh. But it isn't awful. The protagonist is too op, more than any other character. And he's the one that carries the series. The rest of the characters are too bland. Also he has a harem, because why he wouldn't?
This manga is my guilty pleasure. It's better than the average isekai. Is it the best? No way. But there's too many bad isekai's out there. Compared to those series, Maseki Gurume is okay. The character isn't an idiot or a douche like many other isekai protagonists. The story is okay, from what...