For me, it's the drop rates/amounts. For example, it will have taken me 9 months to get 1 piece of equipment to lvl 10 for refines for example. Is it really supposed to take me 15-20 years to complete my sets???

The other thing is the matching in decisive bonds. Being matched with people with several hundred thousand power and in level 100's while our server isn't old enough to catch that is maddening.

Otherwise, even in decisive bonds, I usually have a good time and the game overall is pretty fun.