Playing the lightning barb is actually very amusing. Super strong AOE, CC, and if you play with the the new Call of the Ancients "Together as one" you got 50% DMG migration for 30sec for the really hard pacs. But if you increase your +lightning-dmg you can no longer rely on the damage-count on your character screen. Actually I got +41% lightning (see profile below).
When you are lucky and get a new Thunderfury, I can really recommend to use Weapon throw with the mighty throw rune. It seems to procc Thunderfury nearly 100%.