a) Well as said, evil isn't "Fun/curious", it's down right nasty

You don't bargain with infernal powers and get away with it, no matter what you think!
b) I'd rather warlocks were scary because their powers aren't understood, that some are evil,but warlocks are wielders of raw magical force, at will, and that scares the bejezuz out of more trained, disciplined folk. Conflict between clerics wizards and sorcerors vs warlocks?
Plus, it could be good to have thm draw from Elemental forces, so folk are afraid of them because they represent the raw, dangerous natural forces. Warlocks of Storm, of Fire etc. Hm actually I like that...
Also, they'd fit in well with the God of Death in my homebrew, his followers can be of any alignment, but they kill, and the God doesn't care much about their perosnal reasons as long as they do it within his purvue and rules. Neutral god. Even his Lawful GOod clerics who tend graveyards, the bereaved etc slaughter necromancers (as their diety hates the undead)...so having Warlocks amongst his fold..., endowed with the powers of Entropy, hm
"Good" does not always mean "fluffy bunny", so a "Batman" or religious executioner etc could be interesting too. Stuff being Mr Upstanding Paladin-type!
"The heathens must DIE! Feel the force of my god!"
*eldritch blast leaves behind a smouldering pool of slime*
