There are few features that are still missing in nopCommerce:
1) Since first version of nopCommerce 1.1, all the nopCommerce users are waiting for mass product import / export along with CATEGORY MAPPING. We are currently on 1.8 version and still waiting for this feature. Just because of this a store owner can't thing of maintaining 1000s of products and each product has to go through manual category mapping.
2) Same with Mass import / export of products along with IMAGES, still uploading / adding images is a long manual process and if store owner is planning to upload 1000s of products, images can't me imported / exported in mass. I guess in nopCommerce we are still missing these 2 important features.
3) In the Advanced search option for products, there should be an addition of one more option "Search By Manufacturer Part Number". It is one of the important aspects of product and online customers often search products with Manufacturer Part Number.