The DZ rank goes up REALLY fast too, unlike in the Beta... then again, it's probably just the earlier ranks, and takes quite some time to get to 50.
I was in there for only about 10 mins and am DZ rank 7. Accidentally shot someone while trying to kill an NPC in the middle of an extraction zone, and got my face handed to me by the 6 other guys there when it happened... I already extracted so all I lost were a bit of XP, DZ creds and 2 keys. Also the keys seem to be a lot more common drop than in the Beta. At least, that's my experience so far.
I'm slowly making my way up, by cleaning out all the side quests, encounters, and gathering all intels in each area. Probably won't get back into the DZ for a while.