They made GW more challenging. And removed a retreat function that was quite frankly broken. Not having to deal with any debuffs or opponent buffs is seriously flawed.
I don't expect to be able to clear all GW anymore, even though I've put in a lot of $$ into this game already. And I'm perfectly fine with that.
The sense of entitlement is strong here... Who said that we should all be entitled to always be able to finish all the challenges? What kind of twisted gamer spirit is that? If you hate challenges and areas of the game that will take you time and effort to beat - maybe even several weeks of planning and toon leveling - then why are you even playing a multiplayer game online? Go back to playing solitaire with you.