I don't know that Jedi Outcast ever was released on Gamecube or not...
I make it a rule to play FPS games on PC generally. The format for using a gamepad and playing a FPS doesn't jive well with me (Though I used to love using a joystick and keyboard, but even that's faded IMO).
A good example of how mouse/keyboard is superior is the recent PC port of Halo. The aiming/movement physics weren't really changed between the X-Box version and the PC port, and there's a VERY noticeable difference. For PC users, it means the aiming in Halo is really simple. They "dumb it down" (for lack of a better phrase), basically, for the consoles... So now the PC version you just point guns in the general direction of enemies and can hit them. There's little skill involved, and accuracy's all but forgotten.
FPS's generally control better on PC though, and more "realistically", and with a little more skill involved. Another good example of ports not translating well is the entire Medal of Honor series. In PC, there's intense skill and speed involved in aiming... It's a PC-based series actually. But, the ports of MOH which just basically scripted a "new"/similar version of a game on the PC engine and ported it to the console's format has a really crappy aiming system that didn't translate well over to console. Subsequently I give all the MOH console games pretty low ratings compared to Allied Assault, Spearhead, and Breakthrough.
Of course, NONE of them are comparing to that last WW2 FPS game I played by the makers of Castle Wolfenstein... Forget the title now all of a sudden but it's a REALLY intense game, and ran smooth as silk on my machine with pretty high graphics settings.
Anyway, back to the topic...
The PC version of Outcast is great, so I'd recommend nabbing it if you can Louie... I don't think it was ported to the Cube, just X-Box... But since we all have PC's it's still an option anyway.