He also said we just perceived that we were getting Dazed more in Outland for a variety of reasons including that we ran into more same level or higher mobs in Outland than on Azeroth. Mike called this a "little shaky". It seems that the programmers thought so too, looked into the mechanics a bit deeper and lo and behold we have this note in Patch 2.2:
Daze: Defense skill will no longer reduce the chance players have to receive the Daze effect when attacked from behind by enemies.
Bunnies (female Gnome, of course) called out Drysc on the forums to explain the descrepancy. Happily, Drysc took the challenge:
Shortly after that write up, and due to us going back through the code, the programmers found that a character's defense as a whole was being taken in to account, and not just their base defense as intended. It was definitely our mistake in only looking at what values are taken into account when calculating daze, and not how those values are generated. They're separate bits of code in different locations, so it wasn't easily or immediately apparent.