Joining a warzone match, just to find your team is losing terribly, is a bit disconcerting. Currently, there's little incentive to remain in the match. Under some circumstances you can medal farm for maximum commendations/valor depending on the situation, but it's generally easiest just to leave and requeue. It would be nice if joining a match in progress, especially a losing match, offered some commendation/valor modifier to make it more attractive to stay and meaningfully participate. Something a little more adventurous would be adding bonuses for turning the game around or for making it less terrible/one-sided (e.g. for instance in Hutball, personally or cooperatively changing the game from 0-5 to 2-5).
On an unrelated note, it would also be nice if medals better reflected the objectives of the warzone than aspects tangential to the warzone's objective.