So I am a slow learning Dragoon (dangerous combo I know) and last night I got in a mini argument with a friend over when I should use Leg Sweep to stun lock an enemy (non-boss ones). My theory is unless the Tank can't get out of the frontal attack, I only use it on 360 AOEs. Her response was that you only use that thinking with Palis. Is she correct?

What is the rule of thumb then for other tank classes then?