I understand the concept and I do not need a personal backstory for the PC. I concur with others here, that the origin story of BG1 was not much either. One issue I see with origin characters in regards is that they each are annoyingly special plus they additionally share the same origin story as the PC, which is marketed right now as the driving force. This is like Jaheira, Khalid, Minsk and Edwin all being Bhaalspawn, too.
One other problem is the character writing. They are all annoyingly annoying. There is not one I genuinely like, they do not like to share their story, they only come out with it, when there is no other option and even then are awful persons about it. And not even funny and awful like Edwin, or dumb and sympathetic like Minsk. Or crazy and awful like Xzar or Tiax.
To make things worse, they rarely interact with the player on the way, and it is usually to critisise his actions and patronise him. It is also awfully inconsistent. You can romance characters or have a polite conversation in a special cutscene just for them to go back to be awful in the next dialogue. Why is that? Because recording voices is costly. So this is immersion breaking. Apart from the player's choices usually being bad they have nothing more to add, they are rarely constructive, always destructive in their feedback. This would be bearable if there was one person like this in your party, but Lae'zel, Astarion and Shadowheart share that trait, and Wyll/Gale show this destructive character, when the other three are surprisingly quiet. Their origin characters are plain crap in conjunction with the PC.
This will likely only get worse after Act I, if you really have your party locked or some companions might become unattainable afterwards. So you might be stuck with people you do not like because the party make-up demands it.
