As a new Sorcerer I fell in love with Force Lightning and went with lightning spec... until I discovered that the buffs to Force Lightning damage were in the Madness spec. Didn't make sense to me but I re-specc'd anyway into Madness and I'm killing things just fine at level 16. Still early, I know, but no complaints.
Grunts: FL > Shock > loot
Silvers: FL > CD (LS if CD on cooldown) > FL > loot
Simple. (So far.) Dromund Kaas has been no challenge at all, including soloing the heroic missions once I was a few levels higher that the mission itself.