I like the play style of Affliction...

Apply dots to mobs, and ignore them.
Apply more dots to mobs, and continue to ignore them.
Get too many on you, and round-robin your insta-cast AoE fear.

Loot corpses, if you need to for your quest.
Otherwise, have the master as master looter (and opt out of loot), then set the threshold to green (common) or higher; that way, anything with a green/blue/purple will sparkle, for you to Master Loot it to the team.




Once you can get Felguards...
Which is basically immediately, now that they're not a 41 point talent...

Nothing really compares to Demo spec.
I raided throughout BC as a Demo lock, and love the spec.

Felguards are decent tanks and put out good pet DPS.
As Demo, you have the option of other pets too.
I found imps hit surprisingly hard, if you don't need anything tanked.
But all Felguards is hard to... not go with.