Wow i bought some Memorex DVD's on the weekend and wrote 2 games. After about 30 mins for game 1 I got dirty disc. Game 2 gave dirty disc on initial loading of intro screen.
I tried verbatims and I played for 4 hours without a problem. I guess my Samsung MS28 drive is very sensitive or verbatims are miles ahead of most others with regard to quality

Yup, thus far Verbatim (produced by Mitsubishi Kagaku Media in Singapore) is the only manufacturer that has been able to maintain a reasonable quality standard with DL media. There are just so many other variables with the other media that no one can truly predict what kind of results to expect. Among the variables are the burner/firmware revision, the 360 DVD-ROM drive/firmware revision. Hence the reason why you see so many of us recommending Verbatim (or at least MKM produced discs) as they are really the only ones that are compatible with such a wide variety of applications.