I just noticed that the Ultimate Combat errata removed Superstition as a prerequisite for Ghost Rager. That makes Ghost Rager kind of interesting for my Feral Gnasher. The fact he's focused on grappling and intimidation have traditionally made incorporeal undead one of his least favorite types of foes, and getting hit by them usually sucks a lot too.
One thing which isn't entirely clear to me is whether dealing "normal damage to incorporeal creatures even when using nonmagical weapons" means that he'll deal FULL damage to incorporeal creatures regardless of what weapon he uses or just that he'll be able to deal half damage even if the weapon isn't magical. I expect the former, and that's how I've seen it played in the past, but I just figured I'd double check before selecting this Rage Power and later regretting it. Ghost Touch weapons aren't very expensive, after all, and the Guarded Stance rage power could give me more AC against all types of foes (though I don't particularly want to stand around spending a Move action to get it)
Ok, I'll definitely consider this power now. Thanks for the input.