One of the things that has been bothering me quite a bit about the game recently are empty monster lairs and quest prizes not being awarded.

Sometimes you have to kill the monster first before raiding it's lair and sometimes you don't. If you kill the monster first though you seem to have a better chance of getting something. Which makes it kind of hard when it's wandering around and you have to chase it. Assuming you can find it or distiguish it from the other like monsters in the area to begin with. My worst example of this so far was raiding a wilderness zone boss' lair and getting nothing. Then I killed it and also got nothing. Its lair I guess was meant to reward the loot in this case (some bosses actually drop loot at the end of the battle and have loot in their lair.) I was severly disappointed

Also the quests need to all be reviewed to make sure they reward their prizes as intended. I want to say almost half the quests have this issue. Of course bugs are to be expected in a beta but I would expect quests that are already in to be working for the most part. The expectation here is just that more content has to be put in after the beta phase.