You have to be connected to their servers to play it, just like you would with an MMO style game. Unfortunately, just like an MMO style game at launch, their se

You have to be connected to their servers to play it, just like you would with an MMO style game. Unfortunately, just like an MMO style game at launch, their servers are totally overloaded right now and many people are just completely unable to play the game. The uproar is because the online requirement isn't inherently necessary to the gameplay (although EA has done their best to add some multiplayer aspects). It's primarily a business decision intending to make it more difficult to pirate or buy the game used.