I can understand all the hype behind Frozen with the way it constantly subverts many of the tropes found in Disney princess movies, along with the messages in "Let It Go". But yeah, I get where you're going with it being overrated. Anything that's insanely popular can be considered "overrated".
The media ruined Let it Go. They overused the darn thing for months (The View hilariously used it as a theme song), then they switched over and
really ruined "Happy." A song that was meant for nothing more than the party sequence in the opening of Despicable Me 2. Now
everyone used it to the point where it stopped becoming catchy, and started being inescapable. At least we got a Weird Al parody out of it, that sort of makes it better.
Then again, Frozen made a LOT of money (outgrossing every animated movie last year, especially the humongous hit DM2 ), so of course they're going to rail it into the ground. I wish I saw it, but went to Anchorman 2, where I was laughing so hard I was almost choking to death on gummies. Don't bring gummies to a comedy movie, BTW. No regrets other than choice of candy. But Frozen seems genuinely liked. A little overhyped, but it has an audience.
Now PLANES... not only is it overrated, it's overrated in Disney's mind. The first film made back it's budget at a less than impressive 90 mil. The second one opened at a weak barely 18mil. It did make some money (not even close to Frozen's take), but Disney wants to push the line to sell die cast cars/planes.
Also, while I actually saw the whole thing and didn't hate it (but still didn't think it was that great), I'd say the most overrated animated film of the past few years is Cloudy with a Chance of Meatballs. It's... not that good, I did laugh a few times, but I don't think it de4serves the love it gets. They did MUCH better with the Lego Movie, but there's just something about Cloudy that seems meh overall. EVEN if you remove it from the book, which you have to.