We get synced down for dungeons but I have ran across players with gear that's so low, the players can't do their job. Example: running Dzamael (lvl44) and the healer is wearing the Acolyte gear and it's not glamour. I main as BLM so I had to heal a portion because the healer had low gear and ( I forgot to mention no accessories except for the glorious Friendship Ring), my Physick was better.

Solution - make an item level requirement to queue for the leveling dungeons.