Not all trees are going to be amazing for every situation. We're happy to hear ideas on how we can change a given tree to keep it unique and make it useful in raiding, questing, and pvp. :)
Copied and edited this from my PTR post. My $0.02 on Warlock talents:
Dark Regeneration--seems fine
Soul Leech--the new absorb shield seems nice, just gotta get back used to healing combat damage
Harvest Life--seems fine
Tier 2: This tier has so much promise. I think the current medium/long cd cc theme hurts the tier, and should be changed to a short/medium or medium cd cc theme to give locks quicker access to much needed peel options.
Howl of Terror--Why not change this to a 30 sec cd that causes ALL targets in 10 yards (or 8 if 10's too much) to run from you (not run around, but run from you, similiar to the knockback effect pathing) in TERROR (like it used to be. Why was it changed to a fear effect anyway?) for preferably 4 sec? Possible breaking from damage effect should stay, and the melee attack cd reduction as well (might not need that at 30 sed cd).
Mortal Coil--Why put this single target cc in a tier with 2 other aoe cc's? Why not change it to cause the target (keep it as a targeted cc, 30 yd range, with the missile effect too unless that became an issue) and all enemies within 8 yds of the target to wander in horror (like the disorient/polymorph effect) for 3 sec, and heal the caster for 10% max health?
Shadowfury--Only thing I don't like is the new 30 sec cd. It feels a bit too long. Can it come down to 25 sec? And if not can the stun be increase to around 4 sec, or the area to 10 yrds?
Soul Link--Actually works pretty nice in the right situations. I think the 50% pet health reduction may be too steep though and should be looked at.
Sacrificial Pact--Alot of promise here. I don't like paying health for a shield that's designed to keep me from losing health in the 1st place. I also don't like the shield being based off of current health, making it less effective the closer I am to dying (That's backwards. The effect shouldn't change at all). I'd much rather see it based off 25% (or whatever) of just YOUR MAX health (remove the pet from the equation), increased by 400%, and as a upgrade to Twilight/Fury Ward, with a shorter cd (30-45 sec, 20 sec duration seems fine but may have to be reduced on a 30 sec cd). I also think Twilight Ward would work far better if it absorbed ALL spell damage like Cata Nether Ward did.
Dark Bargain--seems fine, once I understood it's not supposed to be complete damage immunity
Tier 4: The recent PTR change to Burning Rush would seem to make this tier (with a tweak to Blood Fear) better as an anti cc tier rather than the current self sacrifice tier (which I'd rather see less of whenever possible)
Blood Fear--Enemy pets/guardians triggering this seems a waste of a GCD, especially if it is dispellable/stealable also. Cd seems a bit too long as well. How about adding a passive, control impairing effect reduction (25-35%? See above note)?
Burning Rush--Movement speed protection is a nice addition. Health cost still seems a bit high, unless it's to keep you from camping in it long term.
Unbound Will--Health cost is too high. Needs to come down ALOT. 2-3 sec of immunity afterwards for me and the pet would be STELLAR as well (since I'm paying a health cost). And it doesn't remove all movement/controlling impairing effects as advertised (The stun from Whitemaine in Scarlet Halls for example).
Tier 5: Just needs damage balanced between the 3. Excellent distinction of perks.
Tier 6: Kil'jaeden's Cunning has spoiled me for this Tier. Serious work will have to be done with the other 2 talents to bring them in line.
Archimonde's Vengeance: Remove the active effect (I don't know of any spell in game currently where I'd wanna lose a passive effect while the active is on cd. Just seems like weird design), then maybe keep or boost the porcupine effect (or change it completely) to 10% and increase it by 5% for each 25% in health you lose (above 75% is 10%, between 75-50% is 15%, between 50-25% is 20%, below 25% is 25%)?
Kil'jaeden's Cunning: LEAVE THIS ALONE. FOREVER.
Mannoroth's Fury: This definitely needs to be a toggle effect like Burning Rush, for the times when I want to aoe without pulling half the instance. Add maybe another passive, theme appropriate effect for single target damage spells too, that doesnt deactive during the aoe toggle (maybe increase their range by 5-10 yards) and that's a wrap.
That's all I have for now.