A light-weighted yet works out of the box - the must have rating and review feature through a simple plugin can be achieved with Spurtcommerce rating and review addon. 

Features:

• The Customer can provide a star rating.

• The Customer can also add a comment along with the star rating.

•  Admin can moderate the reviews.

• Display of Reviews on the Storefront.

• Display of number of 5 stars, 4 stars, 3 stars, 2 stars and 1s star ratings

• Display of aggregate/overall rating.