Try doing some comparisons between Nero 5 and 6 before you think Nero 6 is fault free. I think the biggest contributor to the problem is the software... however, like Bob, I have found big differences in quality between batches of media.
IMO it's just about at the point where I would have released it if it was my product. However, there is a point in the development lifecycle where "growing pains" are no longer acceptable.
P4 2.6C, Thermalright SP94/Panaflo 92MM M1A, IC7 Max3, Swifty MCX159, 1GB Geil PC4000 Ultra Plat, Radeon 8500, Audigy 2, 2X WD Raptor RAID 0, WD 250GB SE, Plex 708A, 166SDVD, LianLi PC75, XP Pro.