We had to ban my son from talking about Minecraft or Terraria until after 6:30pm, it's all he would talk about otherwise.
At first I thought we had some issues to deal with but after speaking with other parents it seems like it is pretty normal.
The day the xbox patch brought the enderdragon (sp?) was better than Christmas for him.
On a related note I picked up a GTX660 for $170 and I'm running Far Cry 3 Blood Dragon on Ultra without any issues, hilarious game. Highly recommended for $15.