I was cooped up in a small town in the south of France during the holidays where there was nothing to do but read and I managed to finish it in a week. I'm glad I read it, it really is a great book (perhaps Henry James and Joseph Conrad had terrible translations, the Pevear and Volokhonsky one was great).
As to Alyosha's character, I have to credit Pevear and Volokhonsky with one important insight: Alyosha is referred to as an angel twice. Dmitri says he needs an angel of the earth when they meet in the gazebo, and later on after Alyosha causes a scene in Katerina Ivanovna's house, Madame Khokhlakov calls him an angel. Now, when you remove all the connotations that we've given to the world "angel" of goodness and purity, you find that Alyosha very much is in fact like an angel: that is to say, he serves the original purpose of the angel, that of the message bearer. Madame Khokhlakov calls him an angel after he has said to Katerina Ivanovna almost exactly what Khokhlakov told him outside. He also takes the money to Snegiryov from Katerina and in general spends much of his time carrying messages from one person to the other.
There's some questions that I feel were left unanswered. For starters, there's the issue of the narrator. He is clearly not Dostoevsky and in fact seems to be an amateur writer with a penchant for useless interjections ("as it were") and who, while he most of the time sinks into the background and becomes the "eternal narrator", at times shows himself to be human in moments of idiosyncracy or even incompetence. We know that he's a human being who lived between these people, and yet he never at any moment interacts with any of the characters (as far as we're led to believe). Which makes me wonder how he could have the omniscient eye of the eternal narrator while being an ordinary human being who did not interact with any of the characters. It's probably an irrelevant question to ask, but it's still an interesting one.
Another thing that was left unanswered was Lise. The last time we see her it's that horrible vision of an evil creature, but we never see anything more than that. I wonder what her inclusion really brings to the novel, and in particular what that last scene in which we see her adds to the overall context.

