Looking at alt character builds...

[Arnath]

Affliction warlocks can be fun, but, while efficient, they do grind quite a bit slower than other classes. Spice it up with half-zone pulls.
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This isn't really true. Affliction builds tend to have almost no downtime, especially after Dark Pact, which makes up for the generally slower killing speed. Also, once you get high end gear, your three DoTs will do ridiculous amounts of damage. In particular, an affliction lock (especially 30/21 affliction/demo) can pull/kill an entire satyr camp in Felwood at once by just throwing Corruption/Agony/Siphon on everything while running around and using Lifetap to get mana back.

Arnath