Poring throughout all IMDb it's quite frequent to find that's what most Hollywood-trained moviegoers think.
I hope this film, as many others in the new French cinema will make them change their opinion.
Crustacés et Coquillages is one of the wittiest comedies around. The script is absolutely unpredictable, with so many funny notes to every "serious" content, that will keep you laughing to it's completely nuts ending. Shot and played beautifully during summertime in Côte d'Azur, this film puts you in a roller-coaster ride of reality, insanity and very serious affairs without ever being annoying or insulting.
The roles are carefully cherry-picked for every character. I wouldn't like to say what many others have already said (telling what the film is about) but to tell you that the meat of this film are the topics of today's real life. Topics that should be encouraged to talk about before things get too complicated with our children. Topics that are simply taken for granted when they shouldn't. As someone else already pointed out, this is a French film with all the possible "frenchness" in it, but, amazingly, taking things on the light side.
Finally, I'd suggest to watch closely the film-making process. Its cinematography, too, is very French and, as such, outstanding, without enormous resources. The cast is perfect: they portray exactly what they are and, then, it turns out to be exactly the opposite! Locations and dim-light situations are pushed to the limits, again, strapping resources. All in all a good film that lingers in the back of your mind longer than you'd think... as its music will surely do, too.