The story and dialogue are very shallow. The Narrator is amazing though and gives life to the characters. However hearing a tough Mob enforcer being embarrassed by the bosses daughter taunting him about a crush and use modern internet slang like “Karen” takes me out of the story.
As for the magic card system it is kind of hard to follow which is disappointing. It feels like there is something more here that I may have missed on first reading. In these litrpg books the interesting thing is seeing the protagonist use the magic system in some unique, ingenious, new way however this protagonist kind of just googles what to do and gets lucky with his opponents.
Overall this is mid tier litrpg.