Good question. Nowadays it's getting more difficult to find content wirth to read. Bitcoin/Altcoin discussion, Trading, Economics boatds are full of spam mega threads and I often have to browse several pages to find interesting topics. This is why I rarely visit these boards. If I see discussion threads with hundreds of these threads replies - I don't visit it because I know that it will be just a waste of time to read it. I recommend to skip these topics.
I recommend to visit Bitcoin Technical Support, Development & Technical Discussion, Serious Discussion and Ivory Tower boards - there you can find a lot of content which is worth to read. Also, one of indicators of interesting topic - it was made by well known Bitcointalk member who has good knowledge in that sphere.