i believe Wii is powerful enough to produce graphics like the Xbox but screenshots is not a way to compare graphics but videos is more reliable!
Super Mario Galaxy and Metroid and Conduit look awesome in motion
why don't you post videos of Xbox games so we can compare?
also, we should compare Xbox graphics two years after it's release, not now
don't mind my username, that was more than 10 years ago, I'm a different person now, amazing how people change ^_^