I have, installed across 8 computers, 5 DVD drives, and 4 Blu-ray drives.
I have found that the cheaper the drive the more noise it produces. The LiteON drives produce more noise than the LG which in turn produces more noise than the Pioneers.
I've also noticed, that when there are problems reading disks (such as dirty ones), the drives have a tendency to make a little more noise.
But that may be just my experience.