Most of the time the Princess contributes to how much I like the movie anyway, but if the movie sucks then I don't want to watch it as much so I wouldn't get to enjoy the Princess so then she'd slip in my ranking.

ariel is my fav princess & the little mermaid is my fav disney movie

In a strange way. If I don't like the movie but I like the princess it makes the princess stand out even more. For example, Sleeping Beauty is my least favorite princess movie. Thus, it makes Aurora stand out more because I only like the scenes with her in it.
I think if I liked the movies and all the other characters too, she would pale in comparison. Same goes for Ariel- her movie isn't my favorite, but she still really stands out, for me.
I love Beauty and the Beast (as a movie), but Belle pales compared to the other characters & the movie itself, hence she is lower.
So yea, I guess.

I say yes because I remmber when certain new princess movie came out it changed except for Pocahontas.But now I have another most favorite princess and princess movie that's now tied with Pocahontas, it's Princess and the Frog!

NO because you make not like the movie a little , but you Love the Princess because of what she do and how her personality is.