I have been using MVE for almost two months now. I have been using X-cart Gold plus, X-cart Platinum Multi-vendor and Magento for years.
Now that I have been working with MVE, it has some design features that I really like but as a Multi-vendor platform the following features should be standard and not require any add-ons - some of these features are not even available as an add-on.
1. vendor/customer/admin messaging - should be included with the platform
2. Store locator: the store locator should auto-populate when a vendor account is created. Software is supposed to save time through automation.
3. Vendor ratings should be a stock feature. Vendor ratings are a core feature of any marketplace.