Personally, I really didn't mind Peter Dinklage's performance as Ghost. His tone of voice felt like it matched the character. It often felt very right.
Nolan North has a different take. It's actually quite nice to hear these two different actors' reads side-by-side. There's a good amount of personality in both performances.
In some instances, I think Peter Dinklage is right on. In others, I prefer North. Neither walks away the clear winner here.
The only thing I think we can all agree on is that there is some clunky-ass writing in Destiny, and even the best actor in the world can't make that sound good.