If I remember the Jedi was much better at parrying, which, logically, would chop most other weapons in half. I seem to remember doing a lot of parrying anyway.
My recollection is that you add your Sense skill to your existing Lightsaber skill to parry.
Considering you need at least a 6d lightsaber skill just to have a reasonable chance of hitting the base difficulty.... Then you add in even a minimal 2d or 3d Sense. Iron fortress.