Wow, no one has posted in this thread for almost a year. Too bad, because it's on a great subject. I just had to post, because I absolutely love Focus on the Family's interpretation of Narnia. Through listening to them, I got my view on what Narnia should be like.
The music is awesome, and really captures the mood well. The sound effects are believable, and Aslan's roar...it's perfect.
Paul Schofield is an excellent narrator, and I love listening to his voice begin with "This is a story..." or "Once, there was a boy..." He reads words in a way that portrays Lewis' style well.
Of the entire series, my favorite is The Last Battle. Once again, the music and sound effects (especially in Tirian's dream) are excellent, and the actors did a phenomenal job in this one. It portrayed that bittersweet feeling of the ending of the series, and I actually teared up during Paul Schofield's last lines as he describes life in the real Narnia.