It works. It's a quick way of farming and leveling. Since the party is controlled by one person -there should be no confusion of who should hit what .

It may take a little longer to level since the exp is split up but also you make up for it by increased killing power. You could farm instances (making good money too). You could go kill elites a little easier too. Apparently PvPing like this brings an insane amount of QQing on the official WoW forums too which is an added bonus!