Xtreme Wheels is a stunt bike racing game that offers nice-looking graphics (with one extremely notable exception), but it's still somewhat lacking. You get a few options for controls, but like most games of this type, gas and brake will always be on the right. On the left, you get the option to use a slider, arrow buttons, or you can use the accelerometer to tilt. The controls feel solid mostly, making you feel in control as you navigate past obstacles.
The graphics in Xtreme Wheels look great mostly, with one very noticeable problem (at least in our testing). In this game the camera is closer to the rider and there's much more detail with the rider, obstacles, and lighting effects in the game. Hitting an explosive barrel produces a great looking exploding effect, and crashes usually result in a splatter of blood. Another great touch is that, when you crash, the game goes into slow motion to make your mistakes much more dramatic.
The big problem we found in the game occurred right at the beginning of our first race. We accelerated out of the start a little too fast, and slammed head-first into a wall. From then on, no matter what we did, our rider no longer had a head. We force-quit the game from the home screen and turned our iPhone 4S off then back on--still no head. Obviously this must be a glitch, but with no way to fix it, we think it's definitely worth mentioning here.
Overall, Xtreme Wheels offers solid controls, good looking graphics (mostly), and cool slow-motion crash effects that add to the fun. But with the headless rider glitch, it might be worth waiting on this purchase until the developers update the game again.