I used to be a huge fan of Prismatic until it mysteriously decided about a month ago that all I want to hear about on main feed is Apple, Gadgets and Social Media. My other 63 interests (including Physics/Web dev/Genomics/Machine Learning/etc...) are nowhere to be seen and I find myself having to navigate through some of them manually to see more awesome stories that somehow don't make it to my main feed.

This is the problem I have with "smart" services that learn about you. They eventually start doing things you don't want them to do and you don't know how to change the behavior.

On the other hand, services like Google Reader have complete transparency. If you subscribe to a blog you really like, a new post will light up on the left and you don't have to be afraid of missing out. It places a little more burden on the user sometimes, but at least I feel that I am in control and that I know what is going on. It gives me peace of mind when I want it.

My (hopefully) constructive criticism amounts to asking for more transparency, and more user control. Find ways of being clever and impressing me, but also allow me to correct/improve or constraint you explicitly when I want to. Otherwise, keep up the great work!