Flesh Wound (Ex) - ...why?
Ok, see, I assume a barbarian is Rage Hopping by mid-levels, maybe you don't and that's affecting your ratings. But i have to completely disagree here. Even without hopping, dropping damage from an attack by half once per combat is a decent ability. But with hopping? Holy Crap! Once every single round you can ignore half the damage from an attack! And the other half becomes non-lethal. Which the Invulnerable Rager archetype gives double DR against! So at Barbarian 10, when you pick up this ability, your Invulnerable Rager is dropping the damage from any one effect by half once per round and having DR 10 against whatever nonlethal damage remains. Flesh Wound is IMO only behind Come and Get Me in terms of best Rage Powers.
Some other notes on rage powers:
I like Spirit Totem. Since the extra attack isn't being made by you, you get some leeway and can apply it at the start, end, or middle of your attack routine, however you see fit. You also can get it when not full attacking. I found that to be handy....
Knockdown is once/rage. Not an issue if hopping, but if you aren't, it uber sucks.
Superstitious is IMO an all or nothing path. Either you embrace it completely, use the human favored class option, get Ghost Rager, and be nearly untouchable by magic... Or you avoid it completely. Going half-assed just means mediocre benefits with potentially very annoying drawbacks. On that note...
Ghost Rager is awesome is going all-out. Your touch AC can get very obscene.
Intimidating Glare and Terrifying Howl are very good if you're going that route. I know you said as much, but I think you should rate the rage powers assuming builds that would benefit from them are the ones taking said powers. Barbarian is a very good intimidation build, especially if Cornugon Smash feat is available.