Well I think that the people who really hype this movie fall into three categories.
First, are those with children who want to go to the movies and see something that appeals to an audience in more than one age group. Frozen does okay with this, though it's no Toy Story.
Second, are those who just really like musicals. My wife falls into this category.
Third, are those trapped in a state of arrested development and yearn to connect with media designed for younger audiences, as it allows them to feel successful in the false endeavor to hold on to their youth. I suspect much of the hype comes from the third group, since they aren't mature enough to not be hysterical about everything they "love" or "hate".
I also believe that a certain portion of the hype is just purely coincidental in that a movie about a prolonged winter happened to debut during one of the worst winters in recent American history. So pop song about being cold and activities to do in said cold tie nicely with the fact that there was extreme/prolonged cold.
That said, it's an okay movie. It's not great, it's not horrible. Probably not worth paying to see in the theaters.