The first reactions have hit social" /> The first reactions have hit social"/>
The world premiere for "Avengers: Infinity War" was Monday.
The first reactions have hit social media.
The film is being praised for its action, spectacle.
Josh Brolin's villain Thanos is being hailed as Marvel's best villain.
Brolin's performance as Thanos is being especially praised as "terrifying" and "excellent."
Some fans have compared the film to 'Empire Strikes Back.'