Too pretentious, not enough going on
First of all, let me start by saying that I've seen and enjoyed several actual good and deep movies, like Requiem for a Dream, Inception and Mr. Nobody. But watching this movie felt like one of the most overlong experiencies in my recent memory, it felt like I was being presented with a series of pseudo-philosophical nonsense.
Also the plot made no sense, Sean Penn was supposed to be dead as shown near the beginning of the movie, but he remained alive during it, and he was old but his mother was young. Do they even bother to instill some sense into the plot?