Here it is. The great conjunction. The culmination of it all. The players: Iron Man (Robert Downey Jr.), Captain America (Chris Evans), The Hulk (Mark Ruffalo), Thor (Chris Hemsworth), Hawkeye (Jeremy Renner) and Black Widow (Scarlett Johansson). Their nemesis: Thor’s evil brother, the god Loki (Tom Hiddleston), hellbent on conquering Earth. An enormously scaled blockbuster, the film is good, yet short of terrific. The banter is witty, the action immense, and there’s sure to be a sequel.