The novel is really good as others have said. Each chapter is quite short and doesn't progress much. The details of each player are okay at first but get boring later on. Almost 30 chapters but there are only a few players.
I think it's the trend of armies taking over the world. But the real thing is to get involved with the protagonist in that world and receive rewards from the system. It's really boring.
Authors who create novels like this are really quite sloppy. Taking characters from different worlds and speaking just one sentence is a waste. It's really chaotic and unsatisfying.