I hit 20 yesterday, I think everyone that got the game should be 20 by weeks end since the short gets you really close to 20 by completing the missions. It's probably the most polished experience I've played so far and it carries the elements of other games very well. As far as end game content I've just scratched the surface so I'll write in more detail later on on how it works but you do open a new playlist when you hit 28 called a "strike playlist" which gets you the light level gear.