The only good Sith in the Jedi Knight game I played was Desann, his apprentice, Tavion, sucked in both Outcast and Academy, and so did Marka Ragnos, who was just a big pussy willow!
Fool! Desann tweren't no Sith! He's just a dark Jedi with a spikey lightsabre. Marka Ragnos was actually the only Sith to appear in those games. Strangely enough he was much easier to beat than Desann.
Agreed on the ROTS lightsabre duel... this is one of the few components of the prequels I like, and there appears to be a lot of work going into it...
P.S. Beards are awesome.