For animation buffs, the visuals are superb, so it isn't a surprise that it won some French award for that. The story, however, is another matter. Since I am unfamiliar with the original material, of which the movie is based, I can only speak to the adaptation.
You can read about the plot or the synopsis for the story line. I think the plot does capture "cattish" behavior quite well. The problem for me was the PC world view of the story. Forget 1920. Despite the period piece timing, the story is very much 2120. Everyone gets along or, more to the point, everyone should get along. Christian, Muslim, Jew, believer and atheist, black and white--you name it, it is here. That utopia awaits should not surprise anyone.
I would say the movie is for animation buffs for the most part. Animal lovers, and particular feline lovers as myself, will get drawn in but lost in the shuffle.