Seems like the right thread for this.
For me personally, none of the companions actually stand out or I suppose interest me heavily Shadowheart is probably, currently, the most interesting one despite all those RNG rolls. Plenty of characters have been fun and/or interesting but the companions, currently, are just tools to get things done. Aka I need Lae'zel for tanking, Shadowheart for healing and Astarion as a rogue. Astarion comes across as aristocracy, up turned nose and all, but all his approval come from being a complete psychopath and his disapproval comes from anything remotely good or competent, which goes against most of the dialogue I've gotten from him. Lae'zel is a fanatical soldier with a supremacy bent, which isn't bad for a character but she's not exactly someone you should trust or even expect to partner up with were it not for the tadpole club. Lets be honest in any other scenario Lae'zel would cut your inferior head off and go home, except if you were a fellow Githyanki supremist. Gale's the guy who couldn't get over being Zeus'd so he went ahead and turned himself into a walking bomb. I mean his general character, attitude, isn't bad he comes across as a level headed guy, outside his colossal fuck up. Wyll strikes me as that delusional hero wannabe who does a dumb to do a good and naturally regrets it. Shadowheart is, to me, the more interesting character. It seems fairly obvious that she was kidnapped and brainwashed to worship Shar, so the story behind that could be interesting. Learning about Shar it makes sense that she'd have to kidnap and brainwash people, she's one of those gods that sane and/or competent people do not worship. Hell, you'd be better off worshiping Bhaal, the god of murder; or Lolth, the goddess of narcissism, she keeps the Drow weak and lesser for her own amusement.
A lot of this stuff could certainly change at the full release from getting a complete story. However, the lack of input from them during the general playthrough does hurt their appeal since you end up only getting these random "Gale Approves" or " Astarion Disapproves" while talking. A majority of their big talks come from going back to camp which can be pretty rare depending on your playstyle. If that doesn't change in the full game than it's going to be a problem. I will also add that, much like some other RPGs, making all the characters pansexual is a bit annoying, talking to Astarion during, my first playthrough, the party and having him go for the "Lets fuck" was off putting, do not like, as I don't swing that way. I think Gale as had that line of talk which pretty much made me write off talking to them. As for the OP, eh, it's an opinion, and this is my mini rant.