I think it’s a very nice idea, this reviewing as you go. Whenever I lend a book or a DVD boxset to someone I like to find out what they think when they are partway through. Who’s going to die, who is a Cylon, etc.
I also like to read books based on “someone on Twitter told me to read it. No I don’t know who they are. Why am I following them? I have no idea.” So far this plan has led me to read Hikikomori and Secret Diary of a Princess. They are quite different (understatement). This kind of thing seems like the perfect basis for a real-time review. I have very few preconceptions regarding what the book is about or who it is for.
Unfortunately, I don’t have the patience to write a blog post for every chapter. You probably don’t want to read one either, I wouldn’t have much to say. So my plan is to write one before I start the book, one after the first chapter, and one at the end.