I always find it a bit odd when I read that Gale is supposed to have main-character-syndrom, even though he and Karlach are probably the chillest companions to handle. Shadowheart, Lae'zel, Astarion and even Wyll have their own dungeons dedicated to them with very dramatic cut scenes in the end, while with Karlach and Gale you just do what you'd normally do and chat with them for a bit.

That said, I really do love Gale's Origin and it has been my best experience with the game yet, I wrote a very long rant about why I love it so much in the Tav/Durge/Origin Character thread. ^^; I started a Durge, but I haven't gotten very far with her yet, because I still somehow felt less connected to the story than when hopping around with one of the Origin characters. I think that might be because the Durge does not really have anything besides the main plot either. Sure, they want their memories back and weird things happen around them but that does not really change your perception of the world in the same way as having a premade character does. Though, I assume, it is a very good compromise for people who like to create a custom characters.