When I saw the trailer of the movie and read the synopsis, I thought "Wow! This is going to be such a great movie!", but let me tell you I did not get what I was expecting.
The movie is a never-ending circle: at each time there is a new element, it ends up just like the other one before "because it's a movie about the resemblance of love and the tides, the sea" (as Manon Briand said herself in French when I saw her). It was a falsely profound movie, falling into total esotericism.
There were some funny parts, but the movie was not a comedy. The scenery was nice and the quality of the images was good too. The actors were good, but they were playing characters for whom I was unable to develop any kind of sympathy.
I believe this movie will be appreciated by many (and I was already proven that), but I think it's only OK to watch but not great at all.
[Actually, Luc Besson did about nothing in the movie. It was only his studio that helped a bit at realizing the film.]