Walking Dad,
I like playing D&D as heroic fantasy, good guys, even if they are often cranky, violent, boozing, frequenters of cathouses

(Being Scots, I tend to have an empathy for grumpy dwarves and wizards, lol!)
Evil is just not cool, seen enough of it in RL to sicken me for several life times :/
I play D&D to get away from RL's ickiness.
I loved the "Homeland" trilogy by Salvatore, extremely well written/engrossing story of the drow's culture, but, in the end they're still repellent, treacherous SOBs.
It would require a good group of gamers to play such a campaign setting (Menzoberranzan) and NOT having it degnerate into nasty acrimony!
Honeslty, how often do you get a player who can run an evil character, and NOT have it ruin play, hm? yes, the do exist, but they ain't common, IMHO.
Warlocks as agents of the fey, elemental, wild powers is great....or characters cursed to have peculiar, deadly abilities that set them apart from the norm, that even they or anyone else may never understand....or to have their fates inexorably bound with some dangerous, destructive entity, beneficial, malign or uncaring, because of some ancient law, cosmic accident or other unexpected fate...those are cool.
But to have it basically be: Warlock = deliberately
choses to be evil...meh
Now, if a tiefling found they had warlock powers due to his heritage, ok, fine. he can't help this, it's a "dark fate he's bound to". Cool, good story.
But then you should also have "dragon born warlock, who's powers come from Bahmut's fury, for ever brimming up in anger at Tiamat's treachery".
Just because Bamhut is Lawful Good, doesn't mean he isn't seriously PO'd at Tiamat, and willing to annihilate her and her minions...being good though, he wouldn't slaughter innocents, but evil doers deserve to be slaughtered, they made a choice...a bad one...so in steps his agent, the warlock dragonborn, and dispenses some serious smack down.
Hm?
