You seem, I was hoping it would replace the penalty with that dinky +1. That would be great, seeing that a Reckless Raging Frenzying Frenzied Berserker gets a -8 to AC, and a +1 would be better...
Has anyone found a use for Blazing/Frozen Berserker? You know, the ones that give you an elemental subtype while raging?
The only reason I would take either one is if my DM was making us fight creatures with those subtypes.