Condition damage ignorge armor ?
Condition damage ignores armor entirely.
Along with armor, condition damage also ignores Protection.
Seems fair to me. Condition builds should be able to destroy anyone without trying.
Your vitality will protect you against condition damage because you will have more health to burn through. If all your gear stats are dumped into toughness, you may or may not have maximized your durability depending on how potent your healing is.
That being said, the most effective way to deal with conditions is by removing them through some means, or reducing their durations.