Gnus has a brilliant system for assigning a score to postings in all sorts of clever ways. You have the simple stuff, like assigning a negative score to a given person, but you can also do more subtle stuff like scoring up postings that are responses to your own postings. It also has various forms of adaptive scoring.
The score then influenced the ordering of threads, highlighting threads that need your attention and hiding threads and postings that you do not want to see. (Most news readers had a bozo-filter that could do the latter, but which didn't really do any of the former well).
What made Gnus such a great newsreader was that, with the use of scoring, I could spend 10-15 minutes per day getting an overview of dozens of active discussions I was having across a bunch of newsgroups. At one point the total number of postings in the groups I was following was around 6000 postings per day, and it took me mere minutes to get an overview of what had happened that was of interest to me.
The idea of scoring applied to RSS feeds would have been brilliant. It would have made following a massive number of RSS feeds a far more attractive proposition.
I still think that there is an opportunity to revive RSS and make it relevant again, but I would recommend that people interested in RSS readers have a closer look at Gnus first. RSS readers need to do a lot more than just aggregate and display feeds. There are some great opportunities in figuring out how to add scoring in a way users can understand. Also I think that harnessing social to provide additional signals that can be used for scoring would be neat.
Is there an RSS reader today that does any of this?