I like they characters, voice acting and also the development of their story (as a fellow wizard, I found Gale
going full megalomaniac wizard
quite endearing and also a bit surprising. But on the other hand their backgrounds - especially if you take them all together - are just too ridiculous to take them seriously. There are some great moments though, but the premise is pretty funny.

I was also often surprised how good the facial expression of the origin characters are. Especially if you compare them to the PC who looks goofy most of the time (in case of a male high elf, others might be better).

Overall it's very well done I think. But I wouldn't say the writing is better than BG2 for example.