Shattering Blade isn’t too bad even after nerfs, imo. With a 2h, I’ve been hitting Frost Strikes for 3.5 mill in arenas.
If you use a 2h tho, make sure to use Rune of Razorice and take Avalanche as it’ll help you build up 5 stacks really quick.
EDIT: strictly referring to PvP, btw.