Adding fake reviews to your site is in the long run a bad idea, it can not only damage your site’s reputation but it’s bad practice. That said I have developed a module that will seed Magento with reviews which could be based on a specific criteria, it does this by creating a unique combination of words to create a readable sentence.
Not only this but it can add the reviews over time at a pace that is SEO friendly and organic.
You might think Google could easily foil such a system but in reality there is such a huge combination of sentences that it would take some genius algorithm to work out that these where being added programmatically in combination with a random time sequence I don’t see how Google would know the difference as long as it’s not overdone.
Getting back on topic the idea of this module is just to seed, marginally boost or test you product ratings for example adding a minimum of 1 or 2 reviews per product to get you started.
Get in touch if this is something you need on your ecommerce store.