After reading the first few pages of Heir to the Jedi, I flipped to the back. There had to be more here, had to be some kind of twist to explain why Luke was using epistolary, didactic language. Maybe he was speaking to a class of Jedi younglings who didn't know that their great Master had once been a student. Maybe Luke was holding back in advance of a big reveal. Maybe he was under the debilitating influence of a dark force user. If Heir had Shadows of Mindor-style bookends, it might have been okay.
But it was none of those. The book is simply disjointed. It reads as if written for younger readers, and in that, it succeeds. It has received mixed reviews, with plenty of readers finding it fun and entertaining, or feeling that the awkwardness perfectly captured a young Luke. If you want to try it for yourself, the 50-page excerpt is a good place to start. If you want more expressions of confusion and disappointment, try my review.
At least it was better than Crucible.