Mid-fielding.
Mid-fielding is a very good part to play in ut2003 because you will see all the action that is going on and you will always be involved in it, in mid-fielding you are playing two roles, you are an attacker and you are a defender, so you stay in the middle region. if one of your teams attackers takes the enemy flag you have to go and support him otherwise it is very likely that the flag will be dropped.
Also, when mid-fielding it is great to have some speech binds (look on the next page "user.ini" to learn how to do this) because they can be very noticeable and they save time. On your speech binds you should have things like, "Incoming mid" or "Take their flag" or "I need backup in the enemies base", you mainly want speech binds consisting of orders.
When you play the role of a mid-fielder, you have to be able to let everyone know where enemies are or where they are going, whet they are doing etc.