Cruis'n Wii looks...well, just look...

[EEPiccolo]

OK, seriously, that can't be a full screenshot. If you look closely, you'll see that each rendered pixel is actually taking up 2x2 pixels in the JPEG image. That means the original image only had a 300 x 204. So the original looked like this:



And this image still looks more jaggy than it would in the real game, because stretching it then shrinking it back down again results in edge distortion.

I don't think anyone needs to worry about aliasing (the technical term for "jaggies"), as I think this is just a bad pic. However, I would be concerned that there are many Gamecube games that look better than this, even ignoring the aliasing.