The review system ensures that users see reviews based on thorough research, rather than content without added value that simply provides a summary of multiple products. Google rewards high quality reviews.
Furthermore, other factors such as functionality are also evaluated, such as appearance, noise level, etc.
The review system mainly evaluates review content at the page level. However, for sites with a lot of review content, other content within a site may also be evaluated. This can happen if a high double-digit percentage of the website content is reviews.
Currently, this system applies to the following languages worldwide: English, Spanish, German, French, Italian, Vietnamese, Indonesian, Russian, Dutch, Portuguese and Polish.