The problem is that with nero discspeed I always get 0 quality on my own burned discs and even 0 or very low with some original store bought printed discs.
Imgburn burns the disc and verifies it all right, then I check it with discspeed, the quality remains high like 94 or 97 for the first 50% then after that, maybe at 54 or 60% I see a sudden Purple spike and it go's to 0.
To make sure I put in a couple of discs I had burned a while ago on my last computer with a benq 1650 burner, which always came up at 98% with taiyo yuden disc, those discs were PS2 games which worked very well, I played trough the games with no problems. But the same thing happens with them.
To top it all off I put in the original store bough dvd-rom of mercenaries and checked the quality of that, it was 94 till like 99% and then it also dropped to 0.
HL2 DVD was read just fine with 97, same go's for Thief 3, BFME, prey.
SC:chaos theory got 49%
With the option scan disc is get a score of 99 or 98% for the burned discs. On my old PC with my old burner it would be 100%.