Go to Stores > Settings > Configuration on the Admin sidebar.
Expand Catalog on the left panel and select Catalog from the drop-down menu.
the Product Reviews section.
Change the value of Enabled to Yes. This is the default setting, which allows users to leave product reviews.
Select Yes for Allow Guests to Write Reviews.
Get rid of the right-hand column compare block. Open the reports folder in the app/design/frontend/base/default/layout/reports directory.
Remove the product page's Compare link.
For grid and list mode, remove the Compare link from the product list page in two locations.
Improve customer service by better understanding your customers.
Social Proof & Credibility
Save margins by fighting with experience.
Give customers a voice and encourage customer loyalty.
Increase your ranking.
Your Customers Are Marketing for You.
To begin, navigate to Stores => Rating. Then select Add New Rating to begin creating your Magento 2 product rating. Enter the new rating's default value in Default Value. Fill in the value for each store view if you're using multiple store views.