--I focus on both.
■If PvE, what type of PvE? [Heroics/Raids/Other]
--I raid regularly (or try to, but that's not a warlock issue...) and try to progress through current content before the next content is released. I do run heroics as well, though not as regularly as I used to.
■If PvP, what type of PvP? [Arenas, BGs, Rated BGs]
--I frequently run regular BGs and arena (mostly 2s at the moment) and occasionally run Rated BGs when enough people can be found.
■What are your biggest quality-of-life issues? For instance, no longer requiring ammo could be considered a quality-of-life improvement for hunters.
--I cannot think of any real 'quality-of-life' issues for this. Most of the ones we used to have (Soul Shards) have been revamped and improved.
■What makes playing your class more fun?
--Meta. Though for a more complete answer, I enjoy how the class is designed and played. Summoning demons are always fun, the amount of control we can have in pvp is great, and our overall survivability and mana efficiency are things I have loved since classic. Oh, and there's also Meta. Mmmmmm.... Meta.....
■What makes playing your class less fun?
--While the new talent system and mastery are nice, I do tend to miss some of the flexibility we had in forming specs, mostly for PvP. The ability to spec 0/30/11 or 20/21/0 or similar variations was a fun way to burn through exess gold, and sometimes actually led to a PvP spec that was quite enjoyable.
■How do you feel about your “rotation”? (Rotation is the accepted order in which abilities are used to maximum efficiency.)
--I enoy Demo's rotation (and everything else about Demo) a lot, and it's become a major reason why I play that spec over Affliction or Destruction, along with Meta. I find the current Affliction spec ('shadowbolt filler') to be a little...choppy I guess. I preferred the sense of flow I got from using drain life as a filler spell. Destruction's rotation was enjoyable if I recall correctly, but I haven't used it in PvE for a while now.
■What’s on your wish list for your class?
--Another guardian pet (A Shivvara(sp) maybe?) would be fun if there was a niche it could fill. In terms of specs, some dispell protection for destro, and something to help demo's mobile single-target damage (molten core improving fel flame as well or something). An alternate use for Demonic Portal, giving us an offensive cc option as well as a defensive escape, is something I've wondered about, and then there's the 'self-banish' idea that's been mentioned here and there over the years.
--Oh yeah, this is where I'm obligated to ask for green fire, correct? Pretty sure that's what the contract said when I first played the class...
--EDIT: Meta, it could use more spells.
■What spells do you use the least?
--I tend to only use Curse of Weakness in PvP, and then only as affliction usually, thanks to the Jinx talent. I use Curse of Exhaustion less and less often now as well, with many classes having instant gap-closers. I keep wanting to add Fel Flame to the list, but I have this sneaking feeling I use it a lot more than I think I do.
--Hmmm, and if summon succubus counts for this, I'm afraid she hasn't gotten out much lately either.