Im very new to the DVD backup community but pretty familiar with the XBOX scene. The first thing I would tell you to do is make sure when you burn your disc that you close/finialize the session. XBOX will not read the disc contents if the disc isn't finialized.
Outside of that, (if your of the mod community) try the latest XBMC...anything released on 9/12/05 or later. XBMC has a new DVD-Player which, although new, has been in development for over a year and is getting positive feedback.