When Rovio says, "song", I expected a legitimate one with verses, a chorus and a bridge, not a 30 second video.
This song was pretty bad, not gonna lie. All it was about is birds and the wintertime, not Angry Birds as a whole. Honestly, they could have been more creative with the lyrics and the length of the song. The one thing that was creative was the title of the song. Otherwise, it could have been about practically any feathered animal that builds a nest.
I'll admit that they're trying to be nice by donating all funds to a charity, but seriously. If you want people to buy a song from you, at least make it worth their money.