Graphically, the Wii version is watered down. Pretty much identical to the PS2 edition. The character sprites look like early PS2 sprites, not as detailed as the 360 edition, and you can see that they look like block figures on the elbows and finger tips. Colors and such, seem blurry. As if I'm playing Guitar Hero on N64. Video quality is weakened, because the animated intros and such are "letter box" for reasons unknown.
The sound effects from when you make a mistake and such, are actually taken from GH1 and 2.
Upside to the Wii version, is online gameplay between friends only, rumble from the Wii remote for a cool effect. Sadly no DLC.
I hate that the 360 edition cannot "invite friends" to battle. Just random people.
The guitar handles quite lovely, just like the 360 edition.
Audio wise, it's equal to the 360 edition.
It boggles my mind, as much horsepower as the Wii can do on games like Prime 3, Smash Bros Brawl. Why did it take a nose dive on the graphics?