Rating is based on personal ENJOYMENT. Technical-wise, I think it's 5 or less.

It's a world-building isekai fantasy with an OP MC (that is a walking treasure trove of power-ups and boosts) meant for casual and ecchi readers. Art is average.

The manga is fantasy-driven - not the genre - since its appeal is on fan service and what men presumably like. It’s pretty much a notch below hentai. It's for light and casual readers not looking for anything deep and meaningful nor dark and intense. Especially when it has harem and ecchi. Its end goal is to build a base for the MC to peacefully live in; because him siding with any nation would bring catastrophe. Again, don't look for anything deep and meaningful because you'll only be disappointed at pretty much everything, thus eventually dubbing this as trash after the first few chapters - which I agree(if I had expectations like yours). If you can get past its downsides with laughter(mockery) then it’d be a good pass-time read.

My advice:
If you like peaceful(boring) development that is reasonably paced(debatable). Go ahead.

If you want frequent(frequent) but not overly dramatic fan service. Go ahead.

If you appreciate an OP MC who's not a badass(he's a merciful coward) and who - like all men - fantasizes and does perverted things, and at the same time is stupider(100x) than you. Go ahead.

For the ecchi lover:
Uncensored chapters confirmed though the censored ones are the majority. Lots(lots) of kissing, expect kinks. MC can take chances.

Overall I enjoyed it, it's boring but good enough to pass time.