I was satisfied with the explanation of changes to the back story. The canonical history is no longer canon and that's okay.
But is no one else bothered by the idea of a fresh Academy grad captaining a starship? Sure, he has talent and instincts. But without years as a junior officer making his way through the ranks, serving as mate here, captaining a smaller ship there, he is surely set up for career failure. Same for the others. That they all take their familiar roles bang out of school is a serious distraction from an otherwise quality reinterpretation of one of our current world's most enduring myths.