Just got stuck in a mission with endlessly spawning enemies. Eventually just held down the PC power button because it was easier than navigating through the menu to quite the game. It has such an interesting story line but the loading screens and the fact that you have to walk through fucking fort tarsus every time to go and get a mission and then you can't launch the mission until you walk all the way back to your javelin, wait for it to turn around then get in and then only launch the mission. Bleh. Will carry on until the main story is finished but doubt I will be playing more than that.