It's useful on tablets when combined with Twitter lists. Each list becomes a Flipboard magazine, you can then flip through meta-pages with substantive link previews, surrounded by tweets. This gives the benefit of Flipboard's UX with Twitter's manually curated content. This use case is buried:
Profile
Following
Accounts
Service Name (e.g. Twitter)
Your Lists
List Name
Before it was turned off, Zite allowed their users to migrate their data (topics, white/blacklist, votes) to Flipboard. For longtime Zite users, there were thousands of data points. Sadly, that data has not resulted in a Zite-like filter of Flipboard's content.