Hell...bottom line is, Demonology is great for grinding but your damage takes a hit. Nice to lvl with i suppose. Affliction deals damage slower, yet doesn't quite gain so much aggro, and is great if you're all about being the damage leader in PVP. My 61 warlock, however, has been fully 5/5/all the rest since about lvl 20. Destro was also great for pvp since, with the help of a succubus, one on ones are completely in your favor. Crits with soul fire landed around, since i was decently geared, 3100. Add to that your immolate+conflagrate dmg, and if that doesn't smoke em, shadowburn and a couple of searing pains should do it...Hey, i like destro for pure dps. Affliction is nice for pvp and demonology is best for grinding. Its all purely based on your experience, not everyone's here. That's my 2 cents.