All that stuff about sharing dreams makes zero scientific or philosophical sense. And no-one can have dreams with that amount of detail, that many actors, that much lightning fast action, etc, etc. Read Daniel Dennett.

There were plenty of stunning special effects and stunts certainly, but I had the feeling throughout that the plot was just a peg to hang these on. If you want to see how to do dreams in cinema, look elsewhere, for example the dream sequence in Wild Strawberries, the Soldier's dreams in The Discreet Charm of the Bourgeoisie, the whole of Un Chien Andalou. Even Buster Keaton did better than this in Sherlock Junior 80-odd years ago.

If you're going to make a film about dreaming, first figure out how to film dreams.