I read this years and years ago, but had forgotten pretty much everything about it when I pulled it off the shelf this week.
Carroll is clearly a gifted writer, but his stories often feel unfinished to me. I don't mean that they need an extra draft, but more that they end as soon as things get interesting. This is especially the case in his short stories, but I found it to be true here as well. As soon as the concept behind the book is revealed, as soon as the characters have a chance to actually engage in a knowledgeable way with the world around them, the story ends. It isn't that the knowledge comes with the death of the characters, but more that the author isn't particularly interested in exploring that part of their stories.
In particular, the SPOILER ALERT idea in the final chapter of being forced to relive your life with the full knowledge of what everyone thinks of you at every given moment is a startling and interesting one, but all we actually get is a few paragraphs about the thoughts of cells and the root of Arlen's mother's resentment of her. In a more fleshed out book this part of the story could have been at least a chapter... hell, this concept could have filled an entire book as we went through formative incidents in Wyatt and Arlen's lives. Here, it's almost a throwaway moment.
In the same way, Wyatt's newfound "powers" are a fascinating concept that barely get touched on. Why even give him paranormal abilities as a result of his dreams with Death and the not let us explore them with Wyatt? Why not let us discover the disappointment of such useless power or see what Wyatt tries to do with such abilities rather than introduce them and then jump straight to dismissing them?
The book also suffers in my eyes on Carroll's reliance on "telling, not showing." The decision of having us read the story as letters or transcripts, or whatnot served to distance me as a reader. Also, it kind of falls apart at the end, as in the case of Arlen... she's been writing or calling Rose all this time, but Rose is clearly not the audience of the final chapter. So who is? Also, if we are reading journals and correspondence, then I would expect the chapters to read like journals and correspondence... but it never does. The language is too "writerly" to be believed. The voice of the characters is too obviously the voice of the writer, and accusations of Arlen being a bore feel flat when compared to the fairly complex and interesting person revealed in her chapters.
In the end, all I *really* took away from the book is "Death is a dick." This portrayal of Death, as a petty, vicious, sadistic bastard is interesting mostly in comparison to how the personification is treated by authors such as Piers Anthony (On a Pale Horse) or Neil Gaiman (Sandman). In this version of reality, suffering is a direct result of Death's disliking you. Death is not a release, or a natural part of life, but a sick and twisted psychopath.
It's a shame, because despite all this, I admire the way Carroll puts words together. I think that From the Teeth of Angels would have been an excellent character study for the author to help flesh out the population of a more interesting, more compelling book.