Like being the NA resident Weabo.
I'll be honest being known really does help in getting people to listen to you, but once your plan fails the first time the odds of them accepting another of your plans for the next few rounds decreases dramatically.
In addition people respond better if they've been losing for the past two rounds. They want a change and are open to an idea as opposed to the first one-two rounds. Keep in mind I never plan in the first match because of the auto-balance afterwards.
Any plan you use with pubs should be extremely simple, limited to only a direction or a clear goal, and avoid take and hold plans except for lulzy ones like barn, those people will follow. Elsewise it's more likely people get bloodthirsty and run off on their own rather than sit on a spot, regardless of the advantages. It helps to if you've been losing suggest as a plan the exact opposite of what you've been doing, I recall this was my most effective strategies in terms of people actually listening when you had that map with two bridges and the choice to go left or right and engage. If you were consistantly losing left, I'd spam go right while I was dead and at the start of next round. Odds are people listen and it throws the enemy team off balance, contributing to their demise.
It also helps to have a few pals of yours shout out and agree with your plan to add some validity to it.