all dex does is crit and dodge. Sometimes its good, sometimes it isnt.
Constitution is always good.
Strength is always good for melee.
-> Dex as pertaining to armor ignore would be fine for daggers.
-> Dex should be something worth investing in ... not just something to add via Champion's Gear for extra dodge n crit.
For instance, if I want to make a good archer unit ... Why would I want to add dex? I don't. Low level dodge bonuses are pretty useless until you get towershields, and regular units can't crit.
Therefore, I just want fast (+2 init) and accuracy (+3 acc).
Would be more fun, imho, if you could invest in Dex on your ranged units similar to how you invest in strength for your melee units.