OBT for Rohan: BF was only about 3 weeks or so. I don't expect this one's beta to be much longer than that.
There is more than one way to get insignias. (VIP/Login rewards, dungeons/grinding, extractor) Make sure and at least log in each day to collect them.
Yes I find mobs in dungeons tank a lot more than 'outside' mobs of the same kind & level. They also tend to gank you. Most of the lowbie players don't have decent AOEs to deal with them.