It is not just an rss aggregator, it is the UI the keyboard shortcuts, the network of sharing, the discovery, autotranslation, market dominance (allowing for nearly any RSS client to keep everything in sync), and tons of more things.
yes! so far i have not found a mobile friendly web app that also saves your feed, or at least a significant amount like g reader. i wish they weren't shutting it'd down.
"Who needs gmail - There is a Mail gem"