I just finished talking with a colleague whose six year old loves minecraft and I remember talking with a twelve year old who was similarly obsessed - to the point of knowing the patch numbers and all the details. The community which grew organically around this game is incredible, and that kind of peer-to-peer promotion is priceless.
Today we're playing it almost every evening after work with my wife in our own server. Doing missions together, building our own city, farming and raising animals.
I just found out the FTB mod pack for it. It's unbelievable how much stuff people have added to the game. Now I can make a portal gun, build a railroad system or design my own futuristic neon city.
I paid like what, 10 euros for this?