I just made the fattest data set ever! I have a level 25 warrior vs a level 28 elite mob. Warrior has 125/125 sword skill, using sword + shield. His stated crit rate is 6.44% (he has 2 points in cruelty and 40 agility). All attacks are made in front of the mob. The mob is Death's Head Acolyte in Razorfen Kraul (he casts renew at 50% so we can get plenty of attacks). He is classed as a Paladin.
We have 1496 attacks in total. The Min and Max columns refer to the 95% confidence interval from the page Celandro linked.
|-------------------------------------|
|Effect Count Fraction Min Max|
|-------------------------------------|
|dodge | 87 5.8% 5.2% 6.4%|
|parry | 192 12.8% 12.0% 13.7%|
|miss | 114 7.6% 6.9% 8.3%|
|block | 58 3.9% 3.4% 4.4%|
|crit | 25 1.7% 1.3% 2.0%|
|hit | 410 27.4% 26.2% 28.5%|
|glance | 610 40.8% 39.5% 42.0%|
|-------------------------------------|
|total | 1496 100.0% |
|-------------------------------------|
A few points of interest. Firstly the parry rate is nowhere near 5%, and this is replicated by my other data above. I can only suggest that Warrior or Paladin type mobs get an additional 5% parry or something similar.
Secondly, the crit rate is way down. The warrior is quoted at 6.4%, but the actual rate is probably below 2.0%. There seems to be at least -1% per level difference happening.
The block value could be 0% +1% per level + defense bonus.
Lot's of weird stuff though.