With technology as advanced as it is, I would certainly say that quality, whether good or bad, is at least more uniform than it used to be. This of course is not based on any emprical study, just my personal experience over the years.
Still, this is not to say that every once in a while a defective scope won't hit the market. The Elite 3200s, for example, are very good scopes and the quality is uniform. However, there was one member that mentioned some problems with it. At the moment, I do not quite recall what the exact problem was, but I do remember that it sounded like a defect that had, or at least should have, been returned back to Bushnell for their inspection.
Still, overall, I would say that quality is much more uniform than it used to be.
Zachary