hello I am player who has moved here from the Euro servers, there seems to be a lack of awareness about power leveling and it's penaltys, almost daily when in a pug (work shifts so play at strange times) the group leader will add a party member four levels above the lowest member ie; a level six member is joined by a level ten member, this creates a -50% penalty to xp, regardless of the level of the quest.
Please stop this - it shows you lack class.