Marc Jennings' Genuine Question

Looking just at John Curtice's work as Actor, there is a clear point of view in the performance. The performance is functional, but it does not leave much after the scene ends. The work never fully settles into the rhythm of the movie. Several choices feel too broad for what the scene seems to require. It is not a careless performance, but it feels under-shaped. My reaction is mainly about this specific film, not a judgement on the performer overall.