Jedi Knight II was out long before Knights of the Old Republic, Snake. This is just a souped-up sequel with more emphasis on the lightsaber combat. Actual combat, mind you, not BioWare's turnbased "spectator" combat system.
And the Jedi Knight series was out long before the Knights of the Old Republic game or even the Xbox was even concieved.
Why don't you go download the demo from the official site, try it out. Try the dual sabers or the saberstaff and go up against some sith cultists, actually fighting with the sabers and performing acrobatic moves like the best movie coreography.
Beats the hell out of anything BioWare puts out, even Knights of the Old Republic. Plus it's set in the New Republic timeline, which rules even harder.