Did you get that from reading the book, board discussions, or actual play with a no-changes Armiger?
The numbers in the book were off (admittedly, as playtesting has revealed), but that's easily fixed. The core concept is fine. Using tweaked DR and other rules (but not a rewrite), my straight-up Armiger is an extremely effective combatant, with different strengths and weaknesses relative to a same-level Berserker. Even if he doesn't deal the DPS to BBEG's the way a Berserker could, he has also survived several encounters that would have left a Berserker quite dead.
A 'serker would be really good mano-a-mano versus some big target, like a Hill Giant. Better off than I. The fight wouldn't last long enough, and the damage output of the giant too high, for the difference in HP and DR to matter. But my Armiger has a lot more stamina than he does, especially against more-but-smaller attacks. Just last week I saved the Spiritualist and Executioner (who were engaged in an Arcane contest) by luring a dozen drow assassins away from them; and taking them all down myself while losing only 2 pts of Con and less than 20% of my total HP. They had to stunt like crazy just to get past my active defenses, and even when they did my DR absorbed all or almost all of the damage they rolled. A Berserker in the same situation could have been in a lot of trouble.