Some might say it's personal opinion - matter of taste and matter of what you handle better. But, a pure cold fact is that mouse/keyboard combination is faster to aim and turn, as gamepad.
And if JediKnightII will be fast-paced and hectic, with great multiplayer option and good servers, people will NEED the keyboard/mouse combination to survive.
Darth Joyda of psx2central fame.
MegaMonkey of Escapemi.com fame.
Klonkku of Tolkienonline.com fame.
Starfox of TheForce.net fame.