I will forever grieve the audience this movie lost because of it's poor marketing. It's got a few too many pop songs and the plot is predictable, but that isn't a deal breaker for me when you have a concept as interesting as this one. The story fully commits to its theme, resulting in some very sincere moments. My favorites are Merlin's conversation with his dwarf self and Snow White saying, "He likes you more than he likes me," to her magical shoes.
I almost feel like Red Shoes engages with its concept in a more interesting way than Shrek, which is what many people have compared it to. Because, unlike Shrek's Fiona, Snow White isn't uncomfortable in her own skin, and that's something I'd like to see more of in animated female characters, especially ones who don't fit into the body size ideal.
If more people would give it a chance, I think they'd find a family film that's filling a gap that has gone too long unfilled.