A review site is a website on which reviews can be posted about people, businesses, products, or services. These sites may use Web 2.0 techniques to gather reviews from site users or may employ professional writers to author reviews on the topic of concern for the site.
Review sites are generally supported by advertising, and in most cases, comparison shopping or "price" comparison. Some business review sites may also allow businesses to pay for enhanced listings, which do not affect reviews and ratings on the site. Product review sites may be supported by providing paid links directly to websites that sell the items being reviewed.
Source :- Wikipedia
Now, there's an easy way to build a review site without know about website designing.. And the design is very professional...