You're welcome to take a look at my book reviews if you like :). I wouldn't say they're necessarily specifically "hub style", but they do earn fairly well (mainly with Amazon sales) and I've been working on my review style for about seven years now. If you'd like, I'd be willing to comment on your existing review(s) with suggestions. Another thing that I often find helpful is to end with a blurb about, "Please leave me a comment and let me know what you think," or, "Was this helpful? Let me know what else you'd like to see here!" or something like that. No one is more helpful for fine-tuning articles and reviews than the people who seek them out and read them, and know what kind of information they want for their buying decision.