Wreck It Ralph. They did a very poor job promoting that movie before it came out anyway, and then after it came out it just got totally swept under the rug. It's really unfair because imo, it was one of the absolute BEST Disney films. The storytelling was fabulous, the world was creative and unique, the characters were quirky and believable, and the message was gold. As a writer, I think it's one of the best stories Disney has EVER told, from character development, to plot, to theme, to everything! Not to mention it really resounded with me personally like very very very few movies have ever done.
I feel very strongly about this xD