Here is what has been working for me for about a month now. I've only made 2 coasters out of a possible 15 successful back-ups and I believe those were my fault for not paying attention. I'll include the steps and all the programs I use maybe it will help. I won't pretend to be an expert and I won't say it's the only right way or the best way but it works for me.
!. Copy the files from the X-Box game disk using Flash FXP. FTP program to the PC hard drive
2. Use Craxtion to patch the files and create the .ISO file
3. Use Nero 6.0 to burn the image to DVD -R and only -R
4. There is no step 4.
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NOTES: Just be sure that you FTP all the files over, sometimes I find that some files get missed to not completed. I dont know why, maybe Flash FXP hiccups or something. But any missing files and it won't run.
I hope this helps, I'm sure ther are many ways to do it, find what works for you.