Possible problem detected, inititaing unofficial Minecraft intro:
"My name is Notch and I'd like to ask you a question. Is a man not entitled to destroy a locked door?
No, says the man at Bethesda, you have to pick the lock!
No, says the man at Bioware, only jedi can do that!
No, says the man at Konami, you have to find a certain item first!
I rejected those answers. I chose the impossible, I chose... Minecraft.
Minecraft! The only doors are the ones you make, and if you decide you don't want them, you can always tear them down."
Four cookies if you get all th references.
In all seriousness, the fun is (in my case) giving monsters the finger as you switch on peaceful mode and freely shaping the world as you see fit. Mountains, rivers, lavaflows, slowly erased from existance if they're not wanted, replaced by whatever strikes your fancy.
Apart from that, there's the whole "people have opinions" thing, explaining how some can tolerate Ninja Gaiden and the like.