Review Detail of Ueiejejdue73737rj in My legendary class is Husband Of Deathwill Sisters?!

Okay, my review could be called unfair as I only read 4 chapters. But it just doesn't make sense. He picks a sword and jump to the skeletons in his first time in a VRG, he also explains he wasn't afraid of them because he has Battle Mode, like if his real life also had skills and fight in the streets to learn his skills(nothing of that was explained, nor how the Battle mode). Also, the no fear made no sense. Then in the same 1.- day and just after like 2 hours he already has perfect swordmanship(he is the successor of the style) to do perfect moves, fight a captain skeleton and do 999,999 dmg in one atk. I just don't get it, nor the life and past of our MC or the fact that he do like 2 months of game play in a normal rpg in less than 3 hours and learning to use a sword perfectly without any experience. I really have no idea how people give perfect scores and reviews here where perfection doesn't even exist.