I feel Christophe Chanvin is not convincing

Christophe Chanvin as Visual Effects Supervisor in High Tension (2003) made me pay attention more than I expected. Many moments pass very fast, and I do not remember much after them. I do not hate it, but it did not pull me into the story. For me, it does not feel very real in many scenes. Some emotions are too simple, and I cannot believe the character enough. Maybe other people will like it more, but this is my feeling.