I will always help out my fellow tanks, because I want to get pops. It's counterproductive to badmouth your opposing tank/healer because that means it's one less tank/healer queueing against you.
I have a tank.
I have decent gear.
I tried ranked.
I was chewed out for not doing hard guard switch and only guarding the healer.
This was the second time I tried ranked.
I have not tried again.