9. World of Warcraft

World of Warcraft Wizard Gameplay

This game was so popular it even inspired a South Park parody episode. Set four years after the events of Warcraft III, World of Warcraft completely changed the videogame landscape. Players can customize their character and decide which side of the battle they want to be on. 

Anytime you can channel your inner wizard and your inner Cartman is a big win in my book.

The numerous expansion packs mean this game never gets old.