The first Arc deserves 5 stars and the rest between 0 and 4.
While being likeable in the majority of arcs, MC personality and tastes change almost every arc leaving only some basic traits of his, like laziness.
The FL of the "I've become my exgirlfriend's stepdad"Arc is truly disgusting. In Mc's mind she represents "women's freedom" but she is just an irresponsible debauchee who abuses her daughter (neglect counts as abuse).
Spoiler
In this arc FL is a 43 y.o. Mother who loves to party, drink and have s*x with strangers without compromises (i don't see a problem in acting like this as long as one doesn't throw away all responsabilities and decency) .
FL who was famous in her youth for being uncontrollable and loving to party fell in love with a man who wanted her property and didn't love her. They married and had a child, the antagonist who "ruined" ogMC life. FL and her family became aware of the husband intentions and guarded themselves against him while alienating the newborn girl as they considered the baby to be guilty by association.
After the husband derailed FL went for divorce and her 4-5 y.o. Daughter was against it because her father was the only one who showed her love, even if it was fake. After the divorce the father didn't want to take custody of his daughter (thinking only in FL inheritance) and so the daughter was left with her mother, who didn't love her and only hated her for being against their divorce.
The little girl was completely neglected by her family and had never been educated or scolded by them, her father, the only one who apparently cares about her, fueled her misbehaviors and the FL silently covered all her mistakes with money, giving her the impression that there aren't consequences to her actions.
The daughter also has a horrible image of her mother because she had spent more time having s*x with strangers than bonding with her. She knows that in her mother's eyes she isn't as important as any of her friends or her one night stands.
In this arc MC gets FL pregnant and marries her. FL doesn't love MC but enjoys how he acts like a dog waving his tail for her. (1st arc he states that he likes obedient women but in this arc he becomes the obedient man).
At the end of the arc FL cuts all ties with her daughter and kicks her off the house without a penny, so she can "learn to be human", something that nobody ever taught her.
Shortly after being kicked the daughter starts to struggle in order to make a living and realizes how unreasonable she has been and changes her mentality. This disgusted me too much because it shows that by nature she is a good person but the abuse from her family made her a b*tch.
Btw, in the original tragedy all the means used to hurt the OgMC are provided by the Fl, so you could say that in this arc MC punishes the cannon fodder and marries the villain who made his tragedy possible. I say that she is a cannon fodder because while she used OgMC as a stand-in for her fiancee, her fiancee used her as a stand-in for her mother, aka Fl, with FL being aware and forcing them to be together.
There is an arc in which the human he possesed has a brain 1000 times better than his even though it's only in the top 10 of human history of that world. It doesn't make sense that the brain of an Almighty Dragon God who is the peak existence is inferior to the top brains of humanity.
Spoiler
At the end of this arc MC brings the brain to his Dragon God body making him much smarter and far less lazy xd