This is, hands down, the WORST game ever made. It's a shame GameSpot won't let you rate games below 1.0.
Visually, JMGSW looks like a Dog's Turd. Or worse. Riders look like a bunch of guys in a vaguely colourful texture, motorbikes look like push bikes with engines, and the terrain looks like an old man's skin. As usual, there's no 16:9 widescreen support, and despite the frame rate hitches, I'd bet this game would easily run on an N64.
Motorbikes sound like prolonged farts, and the bundled songs wouldn't sound out of place at MP3.com.au, home of the world's worst songs. As for the gameplay, your objectives are a collection of useless 'win this race', 'collect these' and 'find the missing stuff', which really seems like things which real MX riders would do when they're in the middle of a race. Come on, people!
This game is so bad that EB Games wouldn't let me trade it in at all, their excuse is "Nobody in their RIGHT MIND would want to buy this game." Which, sadly for my wallet, is true. There is nothing good about this game apart from the fact that it comes in a nice blue case that I could use to hold some case-less DVDs.