I think it's worth it. The biggest difference is the inclusion of action stages, where you walk around and shoot ghosts. You also run your own cafe, which is completely different from working at the Roost in ACNL. You choose what food to put on the menu (and you can only make food if you have the ingredients for them), and you can decorate your cafe however you like. You can even choose how to dress your employees. Even if you come across a ridiculous costume you don't want to wear yourself, you can force your manager or waiter/waitress to wear it.
Perhaps the biggest negative is that there isn't a true multiplayer mode. You can visit other players' cafes, and they can visit yours, but you're really just interacting with their uploaded cafe and not actually playing with another person. It's kind of like the Dream Suite in ACNL. And some of the recipes require rare items that are hard to come by. You might end up playing an action stage over and over in hopes of getting one ingredient you need, and that can be a bit annoying at times.
But unless the idea of the action stages completely turns you off, I think most Animal Crossing fans will enjoy Disney Magical World if they give it a try.
