Woljif is actually somewhat self-aware too, up to a certain extent. He is Chaotic Neutral IIRC. His combat lines are pretty hilarious, outright revealing that he knows he isn't beating anything in a straight fight, so he's relying on you to distract the enemies so that he can run off and sneak attack. He'll also say that it's your fault if he drops to critical HP, in which case... He's not wrong.
Daeran has far more similarities to Astarion than Woljif does, but still fundamentally different in many ways (for one, he's actually the party's dedicated healer, but also a very potent nuker utilizing elements that most enemies in the game don't have any resistance to). He has a lot of hidden depth that later made him one of my most favorite evil companions ever, and said depth for him and Regill in particular makes it very easy to include them in a good-aligned party without twisting yourselves into pretzels trying to justify it. Pay attention to what Daeran directs his ire towards, and the few rare things he chooses to praise. He may seem like someone lashing out against the world, but you'll start noticing that he has actual reasons and targets for that. He did choose to specialize in healing for a reason.
I hope Astarion has as much depth, but we won't know until the full release it seems.
Actually, some of the WotR evil companions are probably among my most favorite (and probably the only ones I've ever liked to begin with, besides Nok-Nok from Kingmaker but I don't exactly consider him actually evil at all). They don't fall into the trap of 'evil = perpetually edgy and chaotically stupid for no real reason'.
