Story was quite good until 80+ chapters. After that, MC started to develop complex of god and author started to cover loopholes in story.
In this novel was stated that this world is real and MC was believing in it, but, at some point, he started to treat NPC just as XP and after some analyzes, I believe he has quite serious mental issues.
Some readers believe that officers are "arrogant idiot", orders and regulations were incorrect and stuff that MC did is fine. But such readers are looking at situations only from POV of MC, and does not look beyond what author shows them.
If we analyze this novel from POV of real life army and other characters, we can see that MC is very stupid, immature and a psycho.
I love smart MC, and I am fine with him being a psycho, but when you show that some random gamer with average talent is smarter than all officers, government, etc... It is a completely different story...
Basically, in my opinion, author does not understand real life.