My main problem with this book was that my professional mind kept pulling me out of the story, proclaiming, "Alaska's bipolar". I'd mutter, "Yes, yes, now hush," and it would insist, "But she is, look how she--" and then I'd have to smack it.

Edit: After much thought (and reading another John Green novel), I've realized that, no, it wasn't me, it was the writing. Her bipolar disorder was being telegraphed so loudly that it distracted from my reading the book.