The Destiny Companion application is well-designed and easy on the eyes, although there are a couple features that have been excluded by its developers.
On the desktop website, users may sort a post's replies either by popularity (Popular), or in chronological order (Oldest First). Replies in the Destiny Companion app are sorted chronologically, but only until one of them is replied to and becomes bumped to the top of the replies. This system causes a sloppy clutter of replies. The implementation of a system similar to the desktop website's "Comment Sort" feature to the Destiny Companion app would be the perfect solution to this problem.
Another feature that's excluded from the Destiny Companion app is the ability to toggle our Guardians' helmets when viewing them. Because they have customized faces, we should have a way to view them out of the game. I borrowed this idea from Faceliss Man's [url=http://www.bungie.net/en/Forum/Post/67908279/0/0]poll[/url].
I hope these features are implemented soon!