The Librarian
Banned
It was pretty cool indeed when all we've had to play with was the Old Russia. But the full game will hopefully have many, many more zones like that. Wouldn't take too long for the lack of map to simply turn into 'play with a fan-made map open on second screen device' and that just sounds like a pain in the ass to be honest.
If Old Russia is any indication, all the free-roam maps will have clearly identifiable landmarks and a layout that will be pretty easy to memorize.
Don't see how a map is sorely needed in Destiny.