Avengers is an action adventure game tie-in to the movie.
In Avengers you play as Captain America, Iron Man, Thor, or the Hulk to protect the Earth from invading aliens. Each character has a specific move unique to that character, such as Iron Man and his laser beams. Gameplay is a simple beat-them-up where you button mash to defeat waves of enemies.
Graphics is Avengers is like an old arcade game, using sprites rather than polygons. It looks low-tech, but the game is detailed, just like the comic book where the movie takes its cues. It is not the most visually intense game, but it does well enough.
Avengers is a simple action game that connects with the movie.