A character without imperfections is an extremely boring character. This goes for all aspects. Even the face shouldn't have perfect symmetry, since real faces don't do that. Spoilers for some of the early chapters of Cleaver of Sin coming up. I really liked the first few chapters until one main aspect that annoyed me a lot. The story felt like so much wasted potential just due to wanting a perfect main character.
It's also been a while since I read it, so some aspects may be a bit off. For a bit of context:
Unlike a typical isekai story, the main character was doing great. Rich, successful, fit, handsome, and has an amazing, smart, beautiful girlfriend. Thus, a character imperfection was introduced, since the character didn't want to be isekaied and liked their peaceful easy life. I liked this more unique angle.
The person that was replaced had committed suicide due to lack of talent and having failed 2 out a total 3 possible attempts at awakening. Each attempt is also exactly 1 year apart and that person would have been exiled for being a failure of an extremely successful ruthless family. After the second failure, he became an alcoholic who wallowed in misery and seclusion until a few days before the final attempt and killed himself. Honestly, very weird to not at least attempt it, if you already went through the effort of suffering a full year. This coincidentally makes it super easy for the main character since he only needs to wait a few days to get his powers. He's super confident that everything will go well, since he believes it always does for isekaied people.
The actual awakening is the turning point that makes the story much less interesting. Getting an over powered power is one thing. Getting a ton of powers dumped on the main character to give them no weaknesses whatsoever is a completely different thing.
From what I can remember, besides the normal awakening the main charcter got a system. The normal awakening was good. The main character got a cool elemental affinity and a strong soul weapon. Then, a system was added.
I honestly think just not using the system trope would have made the story more interesting. Shortly before the awakening the character also essentially just 4th wall breaks and says he should unlock a system during the awakening since all people that get isekaied do, which I thought was supposed to be a joke and poking fun at system novels.
The system proceeds to give a beginner reward that gives him: perfect muscle memory, optimal movement (every movement is perfect), infinite growth potential, perfect mind protection (cannot fall under illusions or be mind controlled, cannot have his memories manipulated, cannot be mind read, immune to soul attacks, etc.), much higher base stats in all regards, perfect 360 degrees sensing (essentially vision) and thus no blind spots, absurdly handsome, godly battle intuition, and absurd adaptation.
Essentially, any kind of struggle he may have had, was basically removed and he gained absurd potential with no weaknesses besides the fact that he would need a short bit of training to gain power. This amount of essentially dumping cool powers on a beginner annoyed me since it was a complete shift in the tone of the story. Suddenly it wasn't about a person who had a perfect life, lose it, and then be forced claw their way to the top in a new world. It became about a perfect person (besides being an orphan, which honestly just made it easier to isekai whilst leaving less regrets), getting an even more perfect starting position in a new life.
Basically just looking at someone do a skill or an attack a bit is enough for him to perfectly replicate and then surpass it. Every other person in the family usually awakened on the first attempt so they should have had a head start of two years of experience. That massive disadvantage was negated within a few days of self training.
It's then also slowly revealed that the patriarch (that is basically never seen), loved the son that got replaced by the main character so much, that there was no chance he would have been exciled. The eldest brother is apparently also absurdly strong, maybe even stronger than the patriarch and super protective of his family. So he also would not have allowed him to be exiled. At this point, it's essentially just spitting on the grave of the person that got replaced.
It was also revealed that he has a perfect memory and will never forget a person if he sees their face and hears their name. Essentially just another over powered skill, and one that he already had in his previous life.
The soul weapon that was unlocked also basically has nothing to do with cleaving. Some kind of axe or a meat cleaver would have made much more sense. Instead he gets a rapier. That reminds me, the soul weapon also had multiple absurdly overpowered starting abilities. One of which was being able to save up to three locations and teleporting to them instantly from anywhere for no cost. The locations can also be replaced at will. The second ability was that the weapon can absorb blood to heal the host. Healing is obvious a super rare and good ability in this world. The weapon also happens to be able to store what seems like an infinite amount of blood, thus an infinite amount of healing. The weapon can also store an large amount of Astra (basically mana) and replenish the main character's reserve instantly.
The best way I can describe it, is that the novel feels like a self insert power fantasy. Starting out with just one or two of the previously mentioned powers would have been more than enough to have an interesting novel. Instead the main character has to be perfect in every way with no weaknesses. If everything was kept the same, but the system removed, that would have solved most of the issues with what felt like just dumping powers on the character.
I just double checked, I read up to chapter 84. Up until this point, there was also no explanation or indication of the actual title of the story. There was also essentially no struggle or tough situation. One fight that was slightly tough, ended when in the next exchange, he annihilates the enemy literally without the situation having changed. It had nothing to do with a trump card.
I'm honestly just annoyed by the wasted potential of the novel.