This "Avengers" doesn't always pop the way that the first one sometimes did, partly because its villain isn't as memorable, despite Mr. Spader's silky threat. And, as is often the case in these comic-book movies, most of the fights are interminable and fatiguing, though Mr. Whedon does fold in moments of beauty, including when the image slows down with each Avenger centered in the frame both together and individually. This centering crystallizes the dynamic that is paramount to the Avengers.
Manohla Dargis
April 30, 2015