I saw it a few days ago and I really enjoyed it. I only saw the teaser trailer (Olaf and Sven fighting over a carrot) and I thought the movie would be really lame. I didn't know about the story between Anna and Elsa until I actually sat down in the theater. Never judge a movie by its teaser trailer!
And I really really enjoyed the ending, how the "act of true love" was NOT a kiss by a hot guy, and how it was putting someone else's life before yours/protecting the ones you love. In my opinion, that is a better message to send to the younger viewers. I actually cried during that scene LOL.