What most game studios have forgotten is to put the "game" in video (or my preference, computer) games. They forget the fun.

The first Unreal was an amazing spectacle, but it was also a blast to play. There are games that jam pack everything they can onto the screen, ultra hi-res this, and ultra-realistic that... but they're missing the play.

Minecraft is not fun because of it's amazing fidelity. It's because of the things it allows you to do, and how much it leaves to your imagination.