I feel Charlie Messenger is not convincing

I watched Inspector Gadget (1999) and Charlie Messenger was one of the parts I kept noticing. The role needs more detail, but the performance stays on the surface. For me, it does not feel very real in many scenes. Some emotions are too simple, and I cannot believe the character enough. Many moments pass very fast, and I do not remember much after them. I remember both the good parts and the parts that did not work so well.