This is the second installment of Zelazny's Amber stories. The good points here are the same as those in the first book: Zelazny's world is interesting, Corwin is an interesting and believable protagonist, the specific fantasy and SF elements of the story are unique, and the voice is effective. Think Raymond Chandler without the restrictions of reality.
The flaws I find are the same as I saw in Nine Princes in Amber as well. The story is really just an installment in a series and not one that can stand on its own. There's a progression of action without a real arc, and that makes the book feel like I'm reading Super Mario Brothers at times. There's little to no character development, though there are revelations that make Corwin alter his plan and make secondary characters change in their dispositions toward Corwin.
Again, a satisfying diversion, and it's probably exactly as Zelazny intended it. What I see as flaws are recognized within serial fantasy as mere convention, so it's another reminder that just because it doesn't satisfy me doesn't mean it's objectively bad.