My networking group was a little confused as to why Google reviews matter, and how they even leave one. Since Google still controls about 2/3 of all search traffic, then it follows that the more you can do to elevate your own listing, the better off you'll be. Once you get 5 reviews from different physical locations (IP addresses), then the average review will appear with the stars right under your company listing on the map. (If you're going to have your employees leave a review, make sure they do it from home and not from the same office!)
The following video includes a brief overview of where the listings appear, and how you can leave a review. It does require that you establish a Google identity, but remember this doesn't mean you HAVE to start checking e-mail sent to a Gmail account. You can simply use this identity for reviews, and to simplify logins for other websites that have integrated the Google login into their security. If you have any questions about this process, or need help in creating your Google+ page, then give me a call.