I used to like GAC because it was one of the few areas of the game that remained challenging, was different every time, and more often than not, what you got out of it was dependent on the time and planning that you put in. There was a gratifying return on investment.
Now it just sucks because you can spend a bunch of time planning, only to lose the whole plan due to random freezes. Until this is fixed, I'm done. I'll get my participation medal and maybe wing a few battles.
I've lost interest in GAC and if it weren't for my great guild mates, I'd be quitting this thing all together.
If CG had integrity, they'd roll back the updates to a known good version and figure out the problem on thier own time and crystals rather than ours.