If I may offer a point: it seems like Frozen didn't hit its target audience anyway. Honest, none of us would think it overrated if it was a kid's favorite movie, but it's the fact that teenagers and adults seemed to have liked it more. That's probably why we find it so annoying, were colleagues and friends sing "Do You Want To Build a Snowman" out of the blue or even worse, if you have a Tumblr account and are swarmed with Frozen symbolism.
Now, I'm not necessarily saying it's bad, but it was already mentioned somewhere in this topic that "people need to stop digging so deep into Disney movies" and I entirely agree. I still feel like the overall message should be obvious, in a cute or silly way to entertain kids. Frozen did not hit its target audience as much as it was intended to and that's why we feel it was overrated.
Agreed with Yog Sothoth, Disney can do better. I still think of Oliver and Company and Tangled as two of the best Disney movies of best time - that's just matter of opinion though!