This mangas saving grace is that the MC isn't some beanpole who was dropped into a world with OP skills and some magical MacGuffin, he's a muscular old/older man who has been training his whole life to be this strong. That is enough, for me at least, to forgive the rest of the harem OP stuff. We also got to skip half of his harem collection, his immediate rise from G rank to S rank, gaining immediate friendship from guild master because he killed on A rank monster and the infamous line "hey, isn't this a cheat?!"