The reason why reviews are usually set out like that is because that's the format that works for most readers, generally. In my personal opinion I don't think people need to go to a huge effort to make the review some postmodern piece of writing deconstructing all the conventions... I think the way most of the reviews are done are fine.
One thing I'd like to add though is that most people don't have a very big attention span at all and it's sad but true but most shorter pieces of writing get more attention than lengthy ones.
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