The overall story the author is building is interesting, and the system is decent. This is LitRPG through isekai means, but uses the amnesia trope, which is annoying. The amnesia does somewhat account for the fact that the MC is dumb, but his decision making makes no sense other than it furthers the plot. I picked up the second volume of this series, and if these issues bother you, then skip it. The decision making only gets worse, and the MC lives through plot armor alone. This includes forgetting everything he learned in the this book, forgetting he is a scout, and generally just wandering intentionally from problem to problem due to some unnamed suicidal tendency.
As to the story itself. It is a dungeon crawl for the first half of the book, and faction wars within the dungeon for the second. The combat is decent, and is frequent. The characters are all horrible tropes. The interplay between the characters makes little sense.