all i can say i am realy satisfied with warlockplaystyle in pve. and i just cant understand why you say that you wish different playstyles because we have them allready.
just a list
1 dotlock you have dots, haunt, sb as filler and soullech(a channeldspell) under 25% as your filler. and the
destruktion % of the overall damage from a affli warlock is maybe 20%.
2 full demo which is a good supporter spec and you have good old sp spamm with dotd and a godmode on a
2min cd also a nice pet that you have to manage.
3. full destro you play most with incin and direkt damage spells on cooldowns
4. demo destro hybrids with another playstyle one with felguard and another with conflagrate
also dezimate which is a nice playstyle.
and there all viable ok there is some spec that does in some situations more damage but not as it was in bc times where you have to spec THE officiel warlockspec that everybody must have.
and i never mind on pvp in wow if i want to play a balanced game i woud play starcraft broodwar or