Value
Sometimes it is the small things that reflect a skill difference between two different players. Value can be one of those small things that can add up in the long way. It is a term used both to measure game sense, knowing when it is appropriate to micro and be very active with your military or when it is appropriate to patrol your units into a fight and focus on your economy. It also reflects on a players ability to get more than was expected or hoped for out of a unit.