I'll just remind people that Arena is meant to be the toughest of the toughest challenges out there. Its meant to be harder than elites with the increased challenges.
People quickly forget that at lvl 36 cap, the Original Arena was just as difficult as it is now, and with the servers issues now fixed, the arena presents a fair challenge. Its gonna be cheap, its gonna make you rage, its gonna make you cry. BUT thats what its for.
I played today and could not finish a full round after several attempts. There's nothing wrong with not being able to complete the arena. It just means I need to improve my game.
Good Luck.
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