They're not all that bad right now, although I'm expecting them to get buffed later on. Just did the first few TC with 149 item level (level 60 boosted gear/2 dungeon drops) & no consumables apart from health pots. I'll try get up to 8 before 9.0 lands just to see how it is, but it'll probably be fine for everyone once M+ is out.
Fun though.