I never used it, what were killer the features that makes it so dearly missed? I would guess solid parsing, being fast and accessible from anywhere, but surely there's more?
I've never used it myself but from the looks of the UI, it seems to be heavily influenced by gmail in design.
It was a fantastic RSS aggregator. Had a superb compact UI you could read on a tiny phone screen in bed. It was fast and (yeah ok, free). It had everything you needed to keep on top of all your feeds.
Everything else pales in comparison (sure I know there's https://bazqux.com/ and the like, but Google Reader just worked).
Apropos my previous comment. I'm 51 and lived through the inception of RSS (Dave Winer, RSS, Atom etc). It was a normal thing before Facebook and Google+ came along and shat on the parade.
I forgot. Feedly works just fine and so do several other alternatives.