I did a bunch of these yesterday and got stuff like Rush Grass and Exquisite Buttons which are pretty much worthless from a crafting standpoint. What's more ,a lot of the times the rewards were heavily skewed toward one person (i.e. one person would get all the loot).

I'd like to suggest that these be a bit more fair in allotting people a good mixture of rare mats, and the opportunity (however slight) to drop something like a minion. Increasing the drop rate of Thav stuff couldn't hurt either...