Cassandra is definitely my favourite character from Inquisition. I adore how she's a total fangirl.
Not a big fan of her religious zeal from time to time though. Partially my fault; I don't like getting disapproval points with characters I like, but at the same time I was roleplaying a Dalish character, who I wanted to roleplay as a 'true' Dalish (my Warden was already the more casual/skeptic type of Dalish). Unfortunately, you do get some disapproval points if you don't fully go along with Cassandra's belief.
But as with many of my IRL friends; just because I disagree with her, doesn't mean I dislike her. Heck, I don't think there's a single character I always, 100% agree with or can't see the flaws in.
Oh and I dislike how she doesn't want to date my glorious FemQuisitor, because vaginas are icky and gross *grumble grumble grumble*