Can you elaborate a little more? Are you getting errors or does it just not sound right?
If issue with the sound I'm guessing it sounds the same on your PC/Mac if you've synched it, which means its likely to be an issue with the CD importing in iTunes?
If so you can try changing some settings in iTunes I'm using iTunes on a Mac so this may be a little different for you if not using a Mac. Go to File>Preferences>General>Import Settings and selecting the Error Correction option.