Review Detail of GregLuck in World Development System

First of all, the story have a good concept but utterly failed to deliver a good story or even sentences. Lots of unsuitable words used, the writing is bad. The pacing is out of place, I get the feeling that the author is rushing things sometimes just to get the story progressing without considering whether it's a good plot or not. The MC developed at an OP pace, from 0 combat prowess to master in merely tens of chapters, from knowing next to nothing to mastering and making breakthrough in almost every single job in merely a few days (in the story). Also, introducing guns in just about 30 chapter is bad move.