No idea why you find no useful apps but there are just too many for me. Maybe you don't social much or surf web much, but may I know what was the purpose you actually buy a tablet for?

I use playbook for online usage most of the time (with the awesome bridge), browser, tweetcaster for twitter (android app), facebook, GeeReader for RSS, Flipboard, mangawatcher, and a handful of awesome games like the recently launched Sonic, GOF 2 HD, Gravity Lab, all angry birds, and not to mention many old game emulators like PS one, Nintendo, gameboy, SNES etc.

If you find playbook has no useful apps... Then any tablet will do the same for you.