Lots of potential, none of it used... (some spoilers)
I really really liked the first half of this movie. It had a really great feel. Also, directing/acting is sublime throughout the movie.
However, after the first half, when the children were arguing about the inheritance, it got boring. After that the movie metamorphosed into some kind of antiques roadshow (like someone else here mentioned), mixed with some arguing, some blowing, a police station visit (about the blowing), a visit to the notary, some whining about inheritance tax and gifting to a museum...
Don't get me wrong. The movie contained some great and funny scenes (like the old lady receiving the expensive vase, being oblivious to it's real value). However there was no plot in this movie. It felt like just a random collection of scenes... nothing really happened. No character development, no story development, nothing else really interesting. Even the ending, with a scene that had loads of potential, was empty. Maybe this was the director/writer's intention, but I sure didn't like it.
Well, maybe if you're an art lover you could like this, but if not, just skip this movie and watch "Dialogue avec mon jardinier" instead. This too is a movie which only contains a limited plot/story, but it is so rich and the feel is so good and refined it's really really worth it.