People with no combat experience or training keeping up with and exceeding warriors who have fought their entire life drives me nuts. I have spent all my life in a sports environment and I know exactly what type of physiological and technical training is needed to perform at a high level. Seeing these protagonists grab a sword and get right in there is anathema to everything I know about how the human body works, and is such a big destroyer of immersion.

One of the big numbers tossed around in sports is 10 years experience and 10,000 hours of training to be truly good at something.