Hmm...do they play okay on your PC?
I recently found a new trick to adding music to MyGIG. I downloaded the latest version of Apple iTunes (it's free). Then I rip the CDs to my PC HD instead of directly to the MyGIG. iTunes named the music in several CDs that MyGIG just listed as "track01.WMA" or whatever. I even have the latest Gracenote database installed but that didn't help in some cases.
Anyway, after ripping them to the PC HD I copy whatever music I want to a USB flashdrive and then upload it to MyGIG. Even with adding these extra steps it goes a lot faster than trying to burn a CD directly to MyGIG, which used to take 12 minutes or so for each one. The bonus is that I can combine multiple CDs as one upload to MyGIG and it will only create one folder. I can still sort the music by album, artist, etc., because iTunes adds that info when I burn it to the PC HD.