Running around with my Imp as a little stamina boosting machine gun was a ton of fun. I did mostly BGs back in Vanilla, so this obviously isn’t the best build for raiding. I ran this build or something very similar for a long time:
https://classic.wowhead.com/talent-calc/warlock/25002-235-5050205102005151
With the bonus stamina only pretty geared tanks usually had more HP. The imp would be tossing out tons of firebolts and next to nobody took the time to kill him - versus the succubus that would regularly need to be resummoned in a BG. Using your Death Coil offensively makes a big difference, too. I’d usually try to get up Immolate first, then instant casts of Agony and Corruption. Then get some distance with fear if they are melee. Shadowbolt, Conflag, and Shadowburn for a quick burst. You can swap in a Immolate + Conflag after your Shadowbolt if you couldn’t get it up earlier - should land around the same time as your bolt because of travel time. And then a Shadowburn afterwards is just one more instant right afterwards - just on the GCD.
Between that quick burst window and your two DoTs and the Imp blasting away most people are dead or close to it without heals.
Conflag + Nightfall was my other favorite spec to PVP with. Something like this (point in imp firebolt can be swapped around to whatever if you never use the Imp - I loved the little dude, and no shard needed):
https://classic.wowhead.com/talent-calc/warlock/25202030122--5050205102005151
If you got lucky with a Nightfall proc to occur while you were hardcasting a Shadowbolt on a Feared or Charmed target (or just at range) you could 2x Shadowbolt, Conflag, Shadowburn. I think I usually pulled out a Felpup when running in this spec for the interrupt, dispel and the paranoia buff to catch rogues first.
I never really cared for being the fire warlock and dropping points into Searing Pain crits.
I don’t really remember worrying about any specific class in a 1v1. There was one specific female human warlock that was in the top raiding guild on the server. She heavily outgeared me (I think I just had the PVP gear from ranking/titles and being exalted with Defilers/Warsong/Frostwolf) and she loved to use the Succubus and Soulfire me for a ridiculous number. We were actually really friendly with each other, though. Knowing everyone on your server is definitely the thing I miss most about Vanilla. I managed to find a screenshot of both of us hanging out together:
https://imgur.com/ge1eZDl.jpg
Almost wish I hadn’t clicked on this thread. I haven’t been able to make up my mind on which class to try in Classic and had pretty much ruled out Warlock since that’s mostly what I played originally, but now this is making me want to play one again
Apparently I can’t have links in my posts
Edit: I added a space before .com in the links above if you care to see them.