Ah, I see now. You want 6 heroic tier feats that your warlock will get good use out of. Let's see what we can find.
Alertness: Nobody likes giving up combat advantage.
Dark Fury: All good and you already qualify for it.
Defensive Mobility: Warlocks have few close or melee powers, with this you are more likely to be able to afford to cast while adjacent to an enemy.
Fast Runner: Every now and then it's time to flee.
Ferocious Rebuke: Make your already impressive Infernal Wrath even better.
Hellfire Blood: All good.
Improved Initiative: Probably not as well as Alertness, but one or the other is okay.
Improved Misty Step: Useful sometimes.
Jack of All Trades: Always handy for skill challenges.
Ritual Caster: Arcana and Religion are both class skills, and rituals do a number of nifty things.
Toughness: Being harder to kill is always good.
Weapon Proficiency: When surrounded, bust out the Bastard Sword and carve a path to safety.
That's what, 11 feats? Pick your favorite 6 and you're good to go.
Without further ado, lets start:
Alertness: Nobody likes giving up combat advantage.
yawn
Dark Fury: All good and you already qualify for it.
Only because I dropped con to 14 and bought wis up to 13
Defensive Mobility: Warlocks have few close or melee powers, with this you are more likely to be able to afford to cast while adjacent to an enemy.
play better tactically?
Fast Runner: Every now and then it's time to flee.
...
Ferocious Rebuke: Make your already impressive Infernal Wrath even better.
seems pretty weak...
Hellfire Blood: All good.
My level 1 feat
Improved Initiative: Probably not as well as Alertness, but one or the other is okay.
I'll likely take this, but it doesnt excite me at all.
Ritual Caster: Arcana and Religion are both class skills, and rituals do a number of nifty things.
I have this pencilled in as level 2 or 4 feat.
The rest are just lame. I guess I was spoiled by tons of cool feats in 3.5
These seem to be boring, lame, and drag me out of character.