Probably one of the most famous shooter game series out there. If you don't know if you should get this game. Here are a few reasons,
- Hours of story content. Literally 6 games in one game.
- Endless amount of multiplayer content with 5 games having their own modes/maps
- One of the most influential shooter games
- Can play co-op campaign with a friend, if you have one
- Halo 3.
- Forge mode if you like making custom maps/modes
- The invention of teabagging enemies after using your pistol to headshot them.

If you haven't decided to play the game for your free 2 hours yet, then I don't know what you are doing.
Overall rating is a 10/10. Would teabag my enemies again.