Tanks tend to end up having larger amounts of block rating because you get block rating for free from defense, and its dropped on a lot of tank equipment as a filler stat. Dodge and parry aren't being kept low, its just that it takes more dodge & parry rating for 1% than it does for block rating. For mitigation purposes, Parry > Dodge > Block > Smack upside the head.
Originally Posted by Compa
On the other hand, they may be shooting for an uncrushable set, which is another subject entirely. Here's a link about that: The Road to Passive Uncrushable - Warriors - TankingTips.com
If you're talking about the Paladin spell Righteous Defense it uses melee hit, but with an odd exception. Here is the excerpt from EJ:
Originally Posted by pootail
Hit affects auto-attack, Seal of Blood, Avenger's Shield, Hammer of Wrath and Righteous Defense. It takes a bit less than 9% hit to be hit capped, the exception is Righteous Defense, while it uses melee hit to reduce it's chance to be resisted, it has the resist rate a spell does, so you'd need 16% hit to cap it against level 73's and bosses.
I'm so tanky I get up at 5:40 in the morning.