Rosy, I agree with you that the problem with Gwen is that the writers who have decided to redefine hercharacterfrom the legends, rather than theoriginalprincess we have her as a servant which I thought was actually a great way to re-tell the story, but have actually have done very little to present her story asindependentcharacter.
Gwen has always felt like a background character from thebeginningand over the course of three seasons I don't think that has changed, her romance with Arthur has been played out with little development, the romance seems to have gone from 0-60 and so the romance feels like it's a bit part to be hemmed in to fit in to the overall story, rather than an important element in theirversionof the re-telling of the story.
As you say, we are given very little on who Gwen is, her family is her father Tom who is killed off, and her brother Elyan who disappears and thenreappearstwice, which seems to imply familial issues, are never explored or expanded upon. Who is her mother, and why is it that the death of her father is never focused upon how it changes her as a person. Why is her relationship to Morgana which is implied was more personal than that of servant and mistress is treated so indifferently?
I think the overall impression that I have of Gwen is that basically she is there to be a cheerleader for Arthur, the constant pep talks that define their relationship, how she is constantly telling him about how great a king he is going to be somedayad nauseum makes her characterrepetitiveand dare I say it that little bit dull, so in a way I can understand why some people might not like her as she is rarely given anything to do.
I hope season 4 will change things in terms of exploring who Gwen is and she develops into Queen Guinevere but I have to admit myexpectationsare low on that point.