Hello,
Yes, your code is also ok.
Add the below code to change the single product review appearance
.woocommerce-product-rating a.woocommerce-review-link {font-size: 0;}
.woocommerce-product-rating a.woocommerce-review-link .count {font-size: 14px;}
.woocommerce-product-rating a.woocommerce-review-link .count:before {content: '(';}
.woocommerce-product-rating a.woocommerce-review-link .count:after {content: ')';}
Regards