Thrusting swords are very fast weapon. But unlike many weapon rapiers dont have R2-attacks, they are able to stun knights-type enemies. So use a running attack + R2. To damage the balance, use charged R2 and Glinstone Phalanx. Three-four such attacks break knights and trolls. I like Rogier's and Noble's swords.
Thrusting swords are really only interesting in PVP. The unique heavy attack backstep is useless in PVE, I mean who're you trying to pull mindgames on? Just spam attack till they're dead. You can mix stuff in, sure. But in PVP you can actually use options to potentially effect other players. Because they're people. Not AI.