I actually liked this movie quite a lot from the start. The opening sequence instantly sets the tension and I found it quite gripping. A bit further into the movie are a couple of situations on the Dutch motorway that are sadly enough quite recognizable. But this also makes the frustration and anger very understandable and you can see things are slowly getting out of control.
Surely there are some situations that are maybe not the most realistic, but if you're looking for that go watch a documentary. It's not less realistic than the average Hollywood movie in my opinion (meaning not too realistic in essence). To me, a good thriller movie can contain some clichés and comedy, als long as it's full of tension. And surely we're terrified of the psychopath.
This movie also let's you think about what is right and wrong, as the main character is clearly flawed in his own ways and certainly had his part in causing the whole situation. It's also not your standard Hollywood happy-ending movie, which for me also is a plus.