Sorry, I shouldn't have said "killed". The commenting on articles in the context of reader was great. We had bunches of gmail friends who would get some good conversations going . Buzz extended that and for a while it was high-quality at least for us.
Do you remember the protests outside of Google offices when they removed that ? One couple even met through reader and got married.
The shared items RSS out was another sad loss. I had set up one client so that he could select news items using that and they would show on his site as industry news. I used it to post stuff to my own site.
Oh, and recommended items basically sucks now and related feeds rarely returns anything. It was like they removed the google magic and left it as just a feed reader.