Just Cause 2 is a sandbox-style action video game. Its gameplay is similar to that of its predecessor, the player is free to roam the game's open world at will, not having to focus on the game's storyline all the time.
This review may contain spoilers
Just Cause 2 took everything good about the first game and made it even better. Graphics are excellent and sound effects are good too.
Just like the first game, there is a great variety of vehicles & weapons, and it offers a vast map to explore, but this one is less boring since there is diversity in the environments (tropical, desert, mountains, etc.) as well as far more collectibles to be found everywhere. These, as well as the main missions and side missions, can provide many hours of game time.
There may be the occasional bug, but from my experience, nothing that should kill the game.