See, that's a big part of her appeal to me. She's a spoiled brat, but she acts normally, considering her age and upbringing. When she realizes she's not going to get the silver spoon treatment, and makes a compromise, I just want to hug her.
With Rin, she was too precocious for her own good. It was unrealistic, and not cute at all. She merely -looked- cute. Granted, Rin turns out to be significantly different than her first impression would have you believe, but it kinda killed the realism when they portrayed her as a 10 year old sexual predator right off the bat.
I know someone's gonna crap on me for dissecting KnJ like that, but I don't care.