Long Sun may be the most conventional of Wolfe's work, at least on the surface. Perhaps because it's told in third person, unusual for Wolfe, it seems more like other, lesser works of SF, until you really begin to understand what's happening, the astounding complexity of the world Wolfe is showing his reader... and you once again are humbled by the talent of this writer. There are no equals to Wolfe writing today; it saddens me he is not a household name, though given the current state of our culture, I understand why he isn't. You have to pay attention to Wolfe. Don't let the simpicity of his prose fool you - not a word is out of place, Wolfe's control over his story should never be doubted.
There's no reason to talk about plot, here. This isn't about plot, though this is one of the more traditional Gene Wolfe works you will find. But the power of Wolfe is not plot. Wolfe is about ideas, about humanity's place in creation, about gods and God, about redemption and determination, about what it is to be human, to want to be human, about failure and dealing with failure, about the loss and rebirth of faith, epiphany, and, finally, understanding of one's place in the universe.
Wolfe rewards like few writers. It's hard work to read him; it takes effort, you have to think, to consider, to realize he is apt to reveal important informantion at any time. There isn't anything, not one word, that isn't meant to be there, no compromise in his respect for his reader's intelligence. But in the end, when you finish a major Wolfe work like Long Sun, you'll have a greater appreciation for what it means to be human. And you'll wish you too could find an Oreb, or have been taught by a Matera Marble, or perhaps, could have spoken, just once, to a Patera Silk.