3 and 4 vs 1 on some classes, I remember being able to fight 3 or more at a time and win through movement and kiting, CCing on the move, and being able to cast AoE with multiple people locked down. And yes, for the most part most roots where not instant, so the tactic would be stun, attack someone else, root the stunned person right before it came off, finish off the previos victim, then finish off the person CCed lock. With enough LoS and movement, you could take out multiple people until they rez zerged you to death.
Now with every class not only have a free break but free CC resistances, (which compounds even more of an issue for locking down Guards and Demos who have already high Stun resists), and the fact almost every CC is a turn to stone 1 second cast, the chances of fighting anything more than 2:1 are not very good, even for a seasoned player.