Online reviews are also important because they can somewhat influence a business's ability to rank in the Google 3-Pack as well as in the organic or natural search engine results. There is also some speculation that reviews on other third-party review sites can help you rank better as well.
According to Forbes, Google uses information from many third-party directories and review sites, such as Yelp.
Whether Google only factors in Google reviews or third-party reviews as well, the bottom line is that the more positive reviews you have, the higher your chance becomes at ranking in Google’s 3-Pack, and not below the 3-Pack line, where you will find a link to "More places." You do not want to be in this spot because you completely lose visibility. The buying public simply doesn’t look beyond the 3 pack.
While ranking in local organic search results (the results that appear just below the 3 pack) continues to be a top factor in whether a company will rank in the 3 pack (typically depending on many variables not discussed here),
a well-optimized website and reviews dominated all other factors.
Why do reviews help? Reviews help Google to use a number of signals for its ranking factors, and reviews help Google's search engine to determine trending businesses, which can increase a company's ranking. This works because reviews have date stamps, so current customer engagement is visible to the engine.
The bottom line on reviews? The importance of online reviews is rising in every important customer category, and numerous surveys indicate that consumers want reviews when making a buying decision. Also, Google’s search results use consumer reviews when determining rankings factors for the 3-Pack.
User reviews are important, and that will not change. So, the longer you wait to start optimizing your reviews, the more you stand to lose. Online shoppers demand reviews and they are responsible for better online visibility and ranking in organic search results and within the 3-Pack.