Well said about love, pineapplewhipaddict, and I wouldn't disagree too much on those points. But in the end, I wish it was a whole lot more than that. Olaf, is actually the character that truly represents unconditional love. Anna represents sisterly love or family love that just exists.
I heard a lot of people say that what makes Frozen great is that it breaks the "tired disney formula". And I'd say, yeah, it could have done that anyway with a better story. But is it REALLY breaking the formula?
Last I checked, Anna does not sing about saving her kingdom covered in ice. She sings not one but TWO songs about finding love. One is about the potential of meeting that love and the second is meeting that love. When that doesn't work, she just falls in love with the next guy. Is that really breaking the tired formula? It's a twist on it maybe, but not a break like people suggest.
Elsa's motivations… aren't really established well. She has no goals but instead to keep hiding. Her song "let it go" then comes out of left field. Maybe she should have sung about wanting to let go before it actually happened? The song comes too late and serves the forced script, rather than the needs of her character.
I wish her parents died on a quest to find a cure for her, making Elsa even more guilt-ridden. I wish she ran away because she couldn't take it anymore… not because she didn't want to "hurt" anyone. "oh whoops, did i do that? i can't help you" is what Elsa is. Not that great of a character. I don't mind flaws in character but when they lack motivation, it's disappointing.
Nobody changes by the end of the movie. Elsa learns control but that's it. Everyone else is the same.