verbatim backups wont play!

hay guys has anyone heard of verbatim backups not working? ive made 6 or 7 backups of my games all using memorex while i was waiting for the verbatims in the mail. all play but dont load great but i asummed it was the media. when the verbs came, i made a backup that had no errors during burn process but it wouldnt load so i used another memorex and it worked fine. last night i tried to backup nba live 08 with a verb and same thing- no errors but wouldnt load so i tried at 4x(1st try was at 2.4x) and got all the way to '' finalize disk'' and got an error so i again used memorex and had no problem. id like to use my verbs because i hear they're better on the laser, not to mention i payed alot for them but seem to be stuck using memorex. any thoughts?