MX Unleashed appears on both the PlayStation 2 and the Xbox, but if you have a choice, the Xbox version is the one to get. Graphically, both games look just fine, but the Xbox version goes the extra mile. It, of course, looks cleaner right off the bat, but it also has widescreen capabilities and support for resolutions up to 1080i, which is nice for HDTV owners. The control in the Xbox version also feels a little bit tighter than its PS2 counterpart.
MX Unleashed looks great on both platforms. The riders look nice, and, more importantly, they animate well. With as many different tricks as the game has, you'll see the riders moving around quite a lot, so bad animation would have really hurt the game's look. The environments are nice and large, and the textures, with the exception of some blurry dirt-road textures, look great. The game does kick up some particles in an attempt to emulate dirt, but this could have been better. Overall, though, the game is graphically impressive on both systems.
Some online multiplayer would have been a much better addition than the ability to drive monster trucks or fly a helicopter is.
On the sound side of things, MX Unleashed sounds realistic. The bikes sound appropriately throaty, and on a surround setup, you'll hear noises like the other bikes coming up behind you. The soundtrack is an appropriate mix of hard songs from bands like Trapt, 3against1, Cinder, and more. If you're playing the game on an Xbox, it automatically mixes in tracks from your custom soundtracks.
In the end, MX Unleashed is another very good entry in a solid series of motocross games. It plays well, and it has great control and a lot of tracks and objectives. The game has decent multiplayer options, too, but online play would have really added a lot here. Regardless, fans of the series or of motocross in general should definitely check it out.