Because I am a glutton for punishment, I'm "rereading" this via listening to the audiobook. Both my mom and I got codes for free audiobooks by this author when we went to Book Bonanza. My mom really enjoyed the audiobooks (we both got the omnibus edition containing the first three books) and seemed surprised when I told her I hadn't enjoyed what I'd read.
I was hoping that this would somehow be better in audiobook form. Some of its problems are less noticeable, mostly because my attention keeps wandering, but I wouldn't say it's better. The narrator's voice has a quality to it that makes it seem like he's constantly repressing a smile - just about everything he says sounds like it's about to lead to a joke.