Amen.
I've been thinking about this a lot lately. But almost nobody is offering RSS at the moment and most publishers who do drop the ball. Feeds are broken or partial.
It might be time to start from scratch though, I'm not sure RSS is simple enough for normal people. Podcast delivery format would be nice, where you subscribe and discover from one aggregated portal and it's finding similar content and making solid recommendations. Maybe inject some type of medium / rank feature so you can track trending content and subscribe to channels of what's popular.