Arthurian Legend

Greetings fellow Arthurian Nerds,
I was wondering what people thoughts about the Lancelot-Gueneviere-Arthur triangle. There's been a number of interpretations of this, from Lancelot having homosexual feelings for Arthur which allowed things to work, to Arthur and Guen having an open relationship/understanding that their relationship was for political purposes, to Arthur just being clueless all along.
How do you think Christianity impacted the translation? And do you think Gueneviere got a fair shake in the whole deal? Every book I've read (in particular the traditional texts like The Death of Arthur by Annonymous) seems to paint Gueneviere as either 1.) weak 2.) a total bitch 3.) a manipulator who likes to play with Lancelot, making him win and lose jousts on her command. Is there any texts that entertains the idea that their might be something loveable about this woman? If so, do they mention what it is, other than beauty?
Thanks for any and all help.