I like Raquelle because I think it's fun for Barbie to have a frenemy. Raquelle stood out to me in Life in the Dreamhouse cause of her funny dialogue.
Also I like how she had character development in A Fairy Secret.
I would understand people disliking Raquelle though because she does go too far sometimes (like in Fashion Fairytale). She is a jerk sometimes but I think it's mostly done humorously, so fans like her regardless of how she treats people.