I really dislike Bianca. Well, to be honest I don't mind her, but I hate the Varric/Bianca stuff. Seriously, keeping a guy on your leash for at least 7 years is horrible. And she is - she must see that Varric is still holding a candle. She laughs off the idea of her family sending assassins after him (which they do!) and is content to let him pine away while she has her cake and eats it too.
I don't fault her for choosing to honour her family - but if she cares about Varric at all, she should have the guts to let him go and find some other happiness.
And yeah, a bit of bitterness that she is the reason we can't romance Varric as Hawke or the Inquisitor, yeah it is there.