Overall, the rate of progression is very good. MC doesn't get super strong super quickly but it also isn't slow. Its balanced perfectly so that after you get adjusted to a new skill of his, you are then sitting on the edge of your seat to see how he will continue to progress. Not every increase in power is large, sometimes its just one or two new auxiliary or small skills so you don' have to worry about MC getting crazy evolutions and skills every few chapters. Not only does the MC progress steadily but the side characters too. MC is op but not to the point that its ridiculous. A lot of the reasons he is op is justified and explained when learning about his backstory, and rest you can file under MC luck, because you wouldn't want some average joe Mc. But he is still balanced and has to struggle from time to time. He doesn't get a bunch of skill all at once and each skill is explained in its entirety. The skills themselves are not usable straight away either, MC and the other character need to learn how to use their skills and the different ways to use them on their own, which takes time, so there are chapters where he is just getting used to a new skill are or trying out an different application for a existing one. MC also is climbing floors and gaining levels like a psycho either, if anything, anybody else at his skill level would probably climb floors faster, however that doesn't mean MC doesn't progress. It could be argued that he progresses more when he is not trying to climb floors then when he is. The skills and powers in the story are very unique and there are very very few clichés throughout the story. MC is also very unique in the way he thinks and his personality (both of them) and you won't get bored of him whether your learning about his past, or watching him slaughter hundreds of monsters while thinking about what he is going to do later. The world background is very good, and there are no giant confusing info dumps. We learn just enough to know how the overall of how things work and that the world is very large, but without giving us actual details about a lot of the world until they are relevant for the story or the MC has reached a level where he would learn of it. When it comes to the writing quality it is pretty much perfect, barely any typos and the English is easy to read. When it comes to comedy, it is not overly abundent or forced and flows in with the story very well and will always make you smile from time to time. If I had do give a downside to this story, it is that it isn't as popular as it should be and I want more chapters per week.
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LIKEOh and I need to add that when it comes to romance and the harem, MC isn't going around chasing girls, he actually doesn't chase them at all. Romance slowly builds between him and the girls but not to the point where you don't notice it. It is all very natural and realistic in a sense as well as satisficing and exciting.