But now that we've reiterated how the mechanics work, which are identical to the PS2 version, we can finally address the most problematic element of Accent Core for the Wii: the controls. Right off the bat, we should mention that there's no pointer support - it's all button-presses and motion controls. As for the controller setup itself, you have a couple options, and fortunately they're very easy to switch around. The default option, and the greatest damage-dealer to the game, is using a Wii Remote and Nunchuck (the Nunchuck is required in this case). If you have a Classic Controller, you can plug that in instead, or you can just snag an old GameCube Controller and use that. The best thing about these varying options is that they just sort of work, on the fly: in the middle of a match, we cycled through all three without having to change any settings, so that's good. As long as things are synced up properly, you'll be ready to play with whatever scheme appeals to you.
So let's talk about your best options first. The Classic Controller has about the same functionality as a PS2 Controller; it just feels a bit different in your hands (of course). Using this option, you have complete and perfect control over your character, but you may want to have a glove or long shirt handy, because the D-Pad will destroy your thumb (as does the PS2 pad) if you don't cushion it. Guilty Gear demands a lot of movement input, and you'll be working that D-Pad like your life depended on it. Besides this minor inconvenience, the Classic Controller is how Guilty Gear is traditionally played on consoles, and it's great.
The GameCube Controller's D-Pad is actually defaulted to "off," so take note of that if you start panicking when your fighter doesn't move. Once you've adjusted that minor setting (the joystick just doesn't cut it), the controller works just fine, and although the button layout is a little strange for the game, it's a much better option than the default.
But using the Wii Remote and Nunchuck is terrible. Accent Core is a member of a long line of extremely fast 2D fighters, and you don't use motion controls for those types of games. It just doesn't work. The only way to get around it is to use the buttons instead, which means that you use the joystick to move (which is tragically inaccurate, especially when dashing) and the Wii Remote's D-Pad for inputting attacks. Left, down, up and right are punch, kick, slash and heavy slash, respectively. No. This will not work either. It's uncomfortable and clumsy, and it ruins the game.
On the other hand, using the motion controls is almost worse, because it not only throws the accuracy of your interface completely out the window, but it starts damaging the actual fighting mechanics, too. For example, swinging the Wii Remote lightly will execute a slash attack, while swinging it fiercely will do a heavy slash (how are we to execute advanced combos like that?). And to do Special Moves, you hold down either C or Z and swing the Wii Remote or the Nunchuck. That's it. The techniques that should take time and skill can be accomplished by waving your hands.
What's worse: pulling off an Overdrive, some of the most powerful attacks in the game, can be done by holding down C and Z and then swinging. This terrible dynamic requires absolutely no skill or timing, and ruins the Overdrive techniques. As you can plainly see, using the default setup really hurts this title, and that's a shame.