this has been a funny read.. stack stam crit and spell power. phase shift imp with dark pact on passive for your mana battery. curse of shadows & curse of elements were loved by any caster in the raid, 3 warlocks and you even got a curse of weakness as well which was superior to other reduce armor/ap on target side from sunder which it stacked with.. and so long as your tank kept your raid informed on missed sunders threat was easy to control. (albeit it more difficult than other classes)
between dark pact and life tap pots and stones a warlock was going to be able to keep doing damage long after your mages/token shadow priest went oom
warlocks held their own in raid and made other classes even better.