I loved the character design because I hated the characters too: Lae'zel was a close minded warrior, Shadowheart a smartass, Gael Mr nice guy not so nice when you do something he doesn't approve, Astarion the vampire rapist... Etc.

But then I kept on playing and I realized they were really deep characters. Lae'zel was indoctrinated super hard, but she's smart and can recognize when things don't make sense, even if she totally believes those things. Shadowheart has been lying to everyone, including herself, and putting a mask on; but she's a really sweet woman. Astarion was abused in every possible way for centuries, and being a total asshole is his way to cope.

My point is, yeah, the characters are flawed and can come across as dicks, but many real people do too until you understand their circumstances. Not saying that what they do is justified, just that they are interesting characters and redeemable from my PoV.