I've had this problem for something like 3 years. I kept hoping it would resolve itself, but it never happened.
I have two drives. An HL-DT-ST GS23N in a MacBook Pro and a PLDS DH-16AES 5.25" drive. Both will not produce DVDs or CDs that don't skip, if they ever finish a burn.
For years I used cheap media and assumed that was the problem. Recently, I got Verbatim DL media hoping to finally solve this problem. No dice.
The GS23N now fails halfway through on Verbatims. Here is a log of the most recent failed burn.
The 5.25" drive will fail at 99% verify on DLs, though it will burn single layers fine, and with OPC enabled the single-layers don't even skip too much.
What's going on here?