As a different note, "Defense" was not removed. "Defense Rating" was. The combat table still determines its base values on one unit's weapon skill versus the other unit's defense skill. You no longer have to level defense or weapon skill, it is always set to its maximum now of 5 times your character level (425 at level 85). These fundamental concepts still exist in the system in how it works, you just can no longer directly modify either of these values through ratings. They still exist behind the scenes. It is because of these stats that you still require 5.6% reduced chance to be crit against a mob 3 levels higher than yourself. They have a 5% base chance to crit, and gain an additional 0.2% chance to crit per 5 weapon skill higher than your defense skill. All tanking specs have a talent now which reduces chance to be crit by 6% which covers this automatically, but it still exists. Behind the scenes the combat table is very much the same.
And yes, base miss rate is still 5%. The only modifier to that is the Night Elf racial, Quickness.
"In anything, if you want to go from just a beginner to a pro, you need a montage." /w TankSpot WTB Montage for Raiders.