The three stories decent but are separate stories with little connect save using the same characters and each could be listened to without having listened to the any of the others.
They are also not LitRPG stories. The first book starts off with a little thought put into RPG mechanics but they are soon abandoned. Book two and three have zero LitRPG mechanics.
The books have decent but not great character development but little progression.
This makes the books mediocre.
Vocals are well done. As always Soundbooth Studios does a great job.