WooCommerce has native reviews built-in
Any purchase online needs reviews/trust/ratings before the buyer will proceed
Reviews are required for both the seller (after purchase), and the product
Will Marketpress 3.x address the lack of review feature?
There are 527 forum threads wanting Marketpress reviews:
site:premium.wpmudev.org/forums/ marketpress review (just stick that into google)
Please +1 this feature request if you are keen to see it ever implemented.