That being said, I still think this is an interesting discussion and I am personally hoping to see more posts from you guys about what you particularly like or dislike about any given armor set and why.
As you can see from my set I too am on the Vanilla/TBC bandwagon. I think warlock T1, 2 and 4 are the best looking sets In the game, bar none.
Tier 15 thousand hells: Hmmmm, Chinese demon. The first part sums up the core of the problem, which I'll get to later. The Chinese art style for demons is too far from the art style of wow for demons for this to work. nice idea though.
Tier 14 sha skin: I....um....what?... Since when do we wear the skin of our foes? Has nothing to do with warlocks
tier 13 faceless shroud: Squidward armour... really?
tier 12 balespider: Spiderwoman... really?
tier 11 shadowflame: Rags with lopsided horns, not really warlocky and generally looks awful
tier 10 dark coven: Granted, this looks pretty good, the blue colour scheme was out of place though
tier 9 gul'dans regalia: Some chaotic energies around the shoulders but otherwise meh...
tier 8 deathbringer garb: Is the armour a copy and paste from Putress or is he a copy and paste from us?
tier 7 valorous plagueheart: Recolour of t3 (see T3)
tier 6 malefic: Wings are cool, looks locky, but too... Tutti frutti for my taste
Tier 4 Voidheart: Awesomeness made manifest, looks like a Voidwalker, the coolest looking demon, void spell effect with lightning, generally purple and black, 100% warlocky, what's not to love?
Tier 3: The yellow is massively out of place, yellow is not a warlock colour, when combined with flames then yes, like on the malefic wings or as trim like on felheart, but not as the base colour for an armour. As for the look of the armour... I dunno, I'm not sure what the designer was aiming for with this, and until I do it doesn't really make sense
tier 2 nemesis: Fel infused skull, horns, generally purples and blacks,very warlocky, again whats not to love?
tier 1 felheart: Horns, reds purples and greens, spiky, again, little bit too colourful, but otherwise warlocky and generally very nice
I see what you've tried to do with the tier sets after burning crusade which seems to be mainly matching them to the current art style of the current tier, which sounds great on paper, but in practice it just doesn't work, your limited too much. look at warlock tier 1,2 and 4. the only ways these related to there tiers was the the nemesis skulls may have come from the dragons that they dropped from, but this is a long shot, the look more like snakes then dragons.
I think i read a blue post that said they wanted armour to look more subdued or some word like that. This is all well and good, but not for warlocks. Warlocks deal with vast, unimaginable amounts of power and entities that with the slightest wrong move could obliterate us mind, body and soul. Due to the distrust of demons and other things warlocky, we are feared and spurned. Warlocks are not people who stand in the background and try to look inconspicuous, there at the foreground, making sure everyone sees them summoning demigod like demons, hurling fireballs that would make a dragon jealous and pulling meteors from space onto there enemies that then come to life and being laying waste to the opposition. Like themselves, warlock armour should scream: LOOK AT ME, HERE I AM, FEAR ME! Tier 1,2,4 and maybe 10 achived this, the others not so much.