Voted for Shooter/FPS/Simulation because i found a new game recently that combines Minecraft with FPS.
Looks actually pretty simple when you read their description.
It's called brick-force and you basically build your maps with up to 8 people and after that you upload the map and then you can play the map like a Counter Strike match with the same modes.
It's still in Closed Beta but definitely worth a look. www.brick-force.com
Personally i think it's a nice change from MC once in a while.