"They" were one guy, named "Notch" who developed the game. Mojang is who he sold the rights to, and they've since had their own studios/etc. But if you take into account ONE MAN made it all, it's quite impressive he designed it that well from the ground up himself. And he made the graphics to appeal to the audience he wanted to market the game to - 8+ but mainly 8-20. Anywhere in there. I can get people who dislike open ended games though, my friends are like that. I don't mind no closure, as long as it continues to hold my interest.