So I went and grabbed 300 (retail disc that I own) off my shelf, threw it in the PC, used Smartripper to copy & decrypt the dual layer disc to my hard drive, and then used Nero Burning ROM to make a DVD-Video disc. I popped it in my PS3 and it worked just fine.
The discs are from a 20 pack with the reorder number 95310. You must have "bad" discs that are either slight physical defects or something that happened when you burned them. Worst case would be your drive in the PS3 is flaky but that would be less likely.