Ok, I have just tested some Warfare skills with Enrage.
1) Whirlwind - does not crit; can miss
2) Crippling blow - crits, can miss
3) Battering Ram - crits, can miss
4) Battle Stomp - does not crit; cannot miss.
As you seem all the skills are weapon-based and there is no common pattern. Unless someone can give more info, this looks like one or several bugs.
