Honest reviews are here.. When I saw "Unparalleled Comprehensive" in the novel title, I was hype like, "This novel going to had OP MC".. Because I like OP MC.. But it is not.. It not OP MC.. To comprehend the technique, MC needs to stare/watch it for a period of time.. The stronger the skills, the longer the duration MC needs to watch that person/item within the short range.. For example, MC needs to watch a person for two days to comprehend a rank 2 technique (2nd weakest) and that IF ONLY MC continue watching it for 2 days straight but how can MC continue to watch an unfamiliar person for the whole two days within short range without stop? At most, you can only spend a few hours on that person, and it will take like a week to get that skill.. Even worse, those skills are not strong skills. MC also didn't know anything about skills he comprehended until the system was complete and announced it.. So, it kind of gambles and is a waste of time to spend using it on a person. It is much better or less risky to use it on others things like books, walls and so on..
Grade 9 cultivator is lowest grade, and grade 1 cultivator is highest grade, while rank 1 skill is the weakest rank and rank 9 is highest rank.. It kinda weird that you flip it one level 9 are weakest while other level 9 are the strongest. As you also read many others' novels, you might get confused.. For example, MC suddenly gets rank 3 techniques, and you are like, "Wait, is it high rank or lower rank?" When the author mentioned that MC is martial art grade 9, I was like,"ok, MC almost break thru to others realm." The author DID NOT TOLD US at all about it until we figure out ourselves when MC tries to learn strong skill to break thru into martial art grade 8..
MC speed of cultivation can be said as slow because he needs to find strong cultivation techniques, which is the author making it hard/nearly impossible for MC to find one..