MC (main character) is summoned with his entire class, but decided not to become a hero with them since they have a seemingly suicidal enthusiasm towards glory in war.
The art is fantastic, by the way. Too much fanservice, in my opinion, but the art always looks great.
I'll hit on the two biggest criticisms here: the original author's morals are in question (why does everyone become his slaves?) and the MC never actually has sex with the women who want him. At least as far as chapter 46.5.
And in one case, the character is a minor, so it makes sense the MC pretended not to hear the comment she made about having his babies. I'd need some time to process that if someone I didn't know well said that to me, too. A hard 'no' if she was a minor, which then further calls into question whether why the MC completely ignored it.
For the rest, yeah, I don't get it. I could theorize that he wants to make enough money to let his slaves buy their freedom... but if that's the case, why does he not say or even think it?
From outside the story, it definitely looks like the author's morals are questionable. From inside the story, I have to say it's a lot better than people are giving it credit for: the story does a reasonable enough job of explaining why and how they become slaves.
To start with, it's a fantasy world that mixes a bunch of generic tropes that come from many different past time periods. Becoming a slave because of debt is something that happened IRL in the past. In this case, there's a literal deity that enforces contracts.
First slave (demon race that's more like Elder Scrolls elves) was already a slave and was bought to keep her from getting sold to someone who would mistreat her because racism is pretty rampant against demons, and less-so but still noticeable against other races.
Second one,
as a saintess, she expected the church to pay for what she owed (which wasn't an unreasonable amount for the work provided), and when they didn't pay it back, she becomes his slave. She does increase the debt later on, but only to not end up a slave of a corrupt church official who was her superior and openly admitted to wanting to sexually assault her.
Third slave
(guild master)
... yeah, this one was weird through and through. I will call this one pure wish fulfillment and poor writing.
Fourth slave (elf girl) had a literal
evil entity possessing her and giving her bad luck; this bad luck included writing too many zeroes by mistake on the contract that would let the MC use his skills to get rid of her bad luck.
The way this happened was actually clever, in my opinion.
As for the plot, I don't really know if there's an overarching plot, but each area has its own local plot, and they aren't too bad for the most part.
Evil often characters lack nuance, which is fine for some and not fine for others. There aren't any plot holes, though, so that counts for something.
The girls fall in love with the MC way too fast.
Overall, taking everything in-story into account, I'll call this above average when it comes to isekai and average when it comes to general storytelling in comparison to the current market. It gets a 6, because the moments that work bring it up a bit, and while nonsensical at times, those moments still aren't plot holes.
As for the original author's morals (or, more likely, internal moral conflict), I do agree that there is a question as to why the girls around the MC all have to be slaves. If the next couple women join him for reasons other than slavery, I think I'll bump this up to a 7.
The only time I've included the author's morals into a rating is when they've written in such a way I believe there to be an IRL effect. I don't see anyone taking any IRL morals from this story.