Arena system is much much more better than before... u cant expect to have 2-3 elwmentalist,to spam all the spells and have OP win..
There is more strategy to use now.
Who said defender is buffed more? Just use a little bit of your brain to strategize the battle...like swap skills,or knockback arrows skills, or other skills to remove the guardians staying on the flag tile....
Why complaints if your teams all elementalist or mages and now it does not work?
I on the other side is investing on different types of heroes so my teams are much more flexible to overcome changes...