I hate co-op games because I have no friends and I have no desire to make any friends. I wish the good old days of gaming came back, where nobody focused on online gameplay, instead just focus on the main campaign.
From what I know you need 2 friends to play it. That's a pretty dick move from Nintendo. They released this game just to fill in their quota of new releases. For example was there need to release Hyrule Warriors for 3DS when there's already a Wii U version? The only 3DS game I currently consider getting is Chibi Robo.