I will say that so far I've been in mostly lower level instances. I've gotten Sastasha, Ifrit, Halatali and Tam-Tara. They appear to be all completely random roulette groups, judging by peoples' gear. No one has had gear remotely appropriate for that level. Everyone is over-geared. We're also usually blowing away everything like the big bad wolf blowing at one of the three piggies homes.