Destiny is a always online-shooter with MMO elements, they don't want to use the word MMO at all and I'd say that's fair. While the dynamic weather and a hyped "alive" code sounds incredible, it may just be that incredible to hear. Also according to the contract Bungie has with Activision they are on the hook for four Destiny games, the first of which should be out late 2013, so Defiance has 8 months to gain players, introduce their world, and for the TV show's 1st season to run it's course.
I've never been a Bungie fan, and absolutely hated Halo so I'm already on the meh list about Destiny, beyond some features that could be vapor to begin with it just sounds like Halo Online to me. I'd wager that Defiance will be just fine, I mean it already has stiff competition already.

