This is a term commonly given to player who leans equally on the skills of
ghosting, quick triggering, and dueling. Power players often wander
somewhat aimlessly from duel to duel shooting opponents. They often only
leave once their teammates have the advantage.
The easiest thing to do as a power play is to move to and from the highest congestion areas of the arena. Making taking out your opponents, particularly the ones that are on your team mates. Its always best to make sure that your teammate has full shields, and that your opponent also is down.
More power to you.