This review plugin is almost perfect, but the only feature it's missing is bulk review import or manual add review in wp admin.
I understand that this feature can be easily abused. However, I'm sure there is many people like me that need to transfer their reviews from a 3rd party review site on to WP customer reviews. I think if someone really wants to add fake reviews, nothing will stop them from adding one by one.
Please consider this for the next update.
Great job so far though!