I personally love the movie and am a big fan of Antonionoi's films.
I do have to point out that one of the recent reviews here mention that some scenes could have been removed without losing anything but thats quite untrue because those scenes he deemed nothing of value actually have been used to point out the seemingly unapparent themes found in this movie.
This is definitely an art movie, so if you want more concrete things to analyze or watch, stay away from this because his movies often have elusive plots and his cinematography often have intentional meaning.
Aside from the artsy abstract themes found here, I did enjoy watching the main character just exist and deal with things that constitute or test his reality so if you are in the mood (and patience) to just watch the guy's ennui and attempt to deal with the mystery, try watching it.