Heh. JK was basically jump, swing, roll. Rinse and repeat until one of the duelists died. Throw in a few special moves with extremely limited practical usefulness and you get the picture. Also, the lightsaber was completely useless in a full-Force (barring lightsaber throw) or full guns fight.
On the other hand, the Ep3 game features:
Completely different lightsaber fighting styles for each duelist.
LOTS of combos.
The ability to use the environment (hurling objects and whatnot).
A fully working (yet somewhat limited) parry and counterhit system.
Force powers that don't disrupt the lightsaber combat.
That is mechanics-wise. Can't argue the fact that the game is boring, as it's pretty short and the fun part of the game (duel mode) isn't very fun to play against the CPU. The co-op mode sucks as well. Still, the combat mechanics are much better than those of JO/JA.
If instead of making it a rehash of the movie plot they had focused exclusively on dueling, it would have been an outstanding game.