Sorry, but I'm still on the fence.

by Anton P. Nym (aka Steve) , London, Ontario, Canada, Monday, February 18, 2013, 12:18 (4084 days ago) @ Injunfett

Grinding only matters in MMOs if you need XPs/currency/whatever to continue playing the game. If those are important in Destiny, then grinding may be an issue; if they're not (if, for instance, the leveling shown was akin to the levelling in Reach or Halo 4) then grinding may not factor at all.

-- Steve's definitely keeping an eye on that issue, but so far there isn't enough info in the public sphere to say one way or the other.