First, European Ship Simulator was not created by the same development team that brought you Eurotruck Simulator. Arguably, there was an effort by the Euroboat team to make it appear that way. Unfortunately, with European Ship Simulator, what you get is a shallow experience at best without any campaign mode, meaningful objectives, or even a sense of immersion to say the least.
I've completed 4 of the missions so far, successfully I might add, and it wasn't challenging at all. You have a short selection of "Missions" along side a mission editor. I started off with a tug boat mission. The tug boat itself was sufficiently detailed and breaking into open sea from the harbor was satisfying, the choppiness kicked up and there seemed to be correct current physics to deal with. That, unfortunately, was about all there was to be impressed by.
Dropping the tug was a simple press-this-button, which displays a bunch of balloons around your boat. All I had to do was select one of my ballons, and click on the balloon from the ship I would be towing. This easy process connects the two balloons together with a rope, instantly. At this point I'm ready to tow. The massive tanker's front end would dip inappropriately into the sea while towing, which was weird. The physics aren't perfect but I can get passed it. There is no complicated mooring procedure either once you get to your destination. You simply float to the next arrow and you're done. Congratulations. *yawn*
Later, I tried the speedboat. A speedboat mission! My objective was to drive my speedboat to a yacht and pick up a rich lady in distress. On my way, I clipped through just about every bit of ocean, I was practically a submarine. Additionally, the reaction of the boat to the choppy water felt so unauthentic that it made me feel like the developers included this irritation just to force me to press the A and D keys a whole bunch of times and not fall asleep.
To spice things up, I tried the cruise liner. I figured, this should be a challenge. Wrong again, and that brings me to my conclusion. European Ship Simulator is a disaster at the price it is asking. I've played more complex and immersive sims on the iPad. I don't know how some people came the the conclusions they did by recommending this game, it really does make me wonder. The game offers you nothing in return for your effort. It is over-simplified, unrealistic and broken. Wait for the massive content update it needs and in the meantime there are better boating simulators out there.