One of the most important elements on a product page is user generated content. This can take the form of pictures, reviews, star ratings, etc. All of this is called social proof. Social proof is a huge factor in someone else's purchase decision. Getting someone to buy a product from a random website is very hard. If you have a few reviews, that eases people's fears and they'll be more likely to buy.
You want to have reviews for your product. Even negative reviews can be good for your credibility. In a study by Reevoo, 95% of consumers think your reviews are fake if they are all positive. So you shouldn't be too quick to delete or block those negative reviews!