Iron Prince is unique in this list (and among most progression fantasy books) in that it takes place in the distant future, on one of many planets in a galaxy at war.
Instead of mystical cores or game or system-imposed leveling constructs, individuals are given CADs (combat assistance devices) that largely do the same thing.
What I love about the book is that the main character, Rei, is the ultimate underdog. He’s done everything he could to achieve success despite his shortcomings, only to get crushed by peers and a governing system that abhors weakness.
His determination to push on is one of my favorite traits in characters, and ensures that we, the audience, remain engaged, even as he learns to leverage his unique gifts. Smart and never boring, I can’t wait for the sequel!