Nor am I, but the ability to create and destroy in detail such as that does interest me...would love to see that applied in a more single-player minded like environment. If a Descent 4 is ever made, I would want it to have the destructibility and variable environment like this game...though maybe with a bit more fine-tuning still, but still a step in the right direction.
Space Engineers is definitely fun. It seems like it was what people were originally thinking Miner Wars was going to be like.