This series can be summarised in one word: brain-dead. Well, maybe that's two words, but you get the idea.
The girls are probably the strongest selling points of the story. They are drawn nicely ;-).
That is probably where all the positives of this story end. The main character has the best luck in the universe and gets cheat items and abilities falling to his lap at convenient times.
Needless to say, he progresses faster than everyone. By now you should get the idea of the kind of story we have on our hands.
There are some more serious topics being touched upon in the story like inequality, gender roles, rape, corruption, social hierarchies, nuclear war and much more. In fact, we have the perfect mix for a very dark seinen but that is not the case. Instead, the story only touches on these things like that's simply how things are and goes on to follow the conquests of our main character.
The treatment of women in this story is the main reason why you might have to turn off your brains before reading this series. They are treated as private property, useful for their ability for childbirth and domestic work. This may be what the author intends to play with but readers should be aware of what is in store for them.
I still wonder how this series evaded the seinen tag.
One might ask how the main character reacts to the darkness of the world he has been isekai'd into? He is having a blast and even condones it. That may change later in the story though.