Season six is a quite a change for the storyline. Some of the original characters have departed the show. Others have been added with interesting backstories. Every season has a theme, persecution of a minority, how to be a good leader, ... This season is a dark one.
With Gwenivere under the control of Morgana. Her character arc has been with unassuming servant girl, to a romance with Arthur, to Queen, and now puppet. What a great role for an actor. To start beloved, and now be despised is quite a range. The small raise of an eyebrow that was so beguiling now makes some cringe with a forboding fear.