Or someone can just mark a target with a "1" (and so on) and you don't have to worry about the tank switching targets or having to wait for some tanks who cycle slower then others... Just a thought.

This /assist method is best used with raids and groups you know... who generally don't have to be told on the forums how to not pull threat.

My FC tanks mark all their targets, PUG tanks don't so I mark one target at a time. If the tanks really care which mob we kill first they'll mark, otherwise they'll let the DPS manage it and work on keeping agro locked down. Haven't had any issues with tanks who put effort in to it. Can't make a bad tank good by babysitting what target they swap to every few seconds, that's their job to manage threat within means, it's the DPS job to not burn to hard when the tank is doing their job.