If you like animated films in general, and like inventive ones in particular, see this. I think it's good on many levels—the story, the style, the feeling. Even the sentimental ending.
But my taste for animation varies wildly. I loved "Monsters, Inc." and hated "Pocahontas." Anime leaves me cold. It isn't enough to dazzle me with animation tricks, nor to play with children's stories in inventive ways on screen.
So this story works with lots of familiar (too familiar) tropes—types of friends, heroes, problems that we know well. The animation (French) is different than both Pixar and Disney styles we know well, and also different than, say Wallace and Gromit (which wasn't American). But it isn't self-sustaining. I mean, it's a little constrained and polite, even when it is taking visual chances. It's all very "nice" all the time, and that goes with the friendly quality of the movie, too.
I sound like a curmudgeon. Not so (I think)! But I tried and tried to get absorbed and just got, well, bored. Sad to say. Judge for yourself. I will say that I think you need to give it a half an hour or so to get into some of the range of the film. But then, if it hasn't hooked you, it probably won't.