Actually, I did the mission of the oil rig, as I think others have done. It's a bit tricky cause you have to pay attention on what's the course of both tugs and you have to pay attention not to let them get too close to each other, but it's perfectly playable. What left me kind of puzzled, is that depending on the distance you are from the oil rig when you connect the ropes, towing ropes have different lengths... that's not right! If you don't place the tugs at the same distance, you'll end up with a towing rope longer than the other, making it really difficult to manouver...
Ciao,
Corrado