Call to Arms is only useful in the late game, when you have Call to Arms of all levels. If you decide to level it up, then it's essential to take - War Cry (doubles the bonus to Wrath from Call to Arms), and it's also good to take Mighty Blow (+5 levels to the calculation of the Call to Arms effect). If you don't take War Cry, you can take Distraction. It's also a good perk. But in general, in my opinion, some luck or defense will be more useful than the Call to Arms skill. However, education is relevant for any race, but not everyone has the real opportunity to level it up, including Orcs.
Bow down and hear our cry,
Our earthly rulers falter,
Our people drift and die,
The walls of gold entomb us,
The swords of scorn divide,
Take not thy thunder from us,
Take away our pride.
G.K. Chesterton: English Hymnal