I give this solid 3 out of 5 stars - it is a series that I will likely keep reading but I will not remember anything about it within a few months of reading.
Good points - MC goes straight for the throat of any issue without tiptoeing around, and he gets the girl(s); fast-paced development.
Weak points - endless low quality exposition, author seems to go by default in the opposite direction of the golden rule of writing show don't tell.
The only good chuckle from Vol 1 came with exposing Efil's Service (B) skill, in a uncharacteristically subtle application of the just mentioned show don't tell principle. Well, if "service" means in the source what I think it does. If I am mistaken, please don't dispel my illusion.