I admit to loosing interest in this subject when I realized that wraithstrike bypasses DR. (I don't see how it's "ambiguous".) It made it too obvious. But I still want to address a few of the arguments from the last few days. I apologize for keeping the thread alive.
Power Attack is not the problem. In 3.0 you could get the 2-for-1 damage by using two weapons. You still can in 3.5 by dual-wielding non-light weapons. Power Attack gives a highly skilled character a chance to deal extra damage against easy targets, which makes sense both game mechanically and in-game. A lot of the time 2 extra damage is a bad trade for 1 AB, and the trade gets worse the more damage you deal. It only looks good with wraithstrike because of the insane effective attack bonus it provides under the right circumstances
One bizarre idea that really puzzles me is that a rule is only unbalanced if it "breaks" in all campaigns and against all opponents. Basically, what people are saying is that "it's only unbalanced when it's unbalanced". No kidding. By that standard there are NO unbalanced rules. But this is the DnD rules board, not the "X's campaign world" board. I think it's a given that if someone says "rule X is unbalanced" they mean "rule X is unbalanced when used in a situation where it can be used effectively".
Against my better judgement I'll try for an example: It's a bad idea for a grocery store to sell poisoned meat. Period.
Even if some people don't eat meat ("nobody plays a fighter-mage in our DnD campaign"). Or don't shop at that store ("nobody uses that obscure supplement in our gaming group"). Or happen to pick a safe piece ("nobody picked that spell in our group"). Or don't eat enough to be really sick ("it's perfectly fine for poorly optimized low-level characters"). Or if a sick customer can be healed with the correct medical treatment ("the DM can take countermeasures").
As for said countermeasures: They're not the answer either. Once an entire campaign world starts twisting to accommodate a single low-level non-core spell something is wrong. It assumes a lot of extra work by the DM. The vast majority of DMs don't want to go over every monster and NPC from Monster Manuals, DMG or published adventures to boost their touch AC by a few points. Nor does it fit most published campaign settings. (Though introducing a few overpowered spells into a world could be an interesting basis for a campaign, as the balance of power changes and everyone scrambles to exploit the new spells or to find defenses.) Even if the DM goes out of his way to make changes wraithstrike will still be devastatingly effective in some situations. A spell does not have to be overpowered against
every opponent to be poorly designed.
"Just give the opponents wraithstrike too" is even worse. Presumably, unbalanced spells make the game less fun. Unbalanced monsters and NPC
also make the game less fun. It solves nothing and doubles the un-fun. Better to talk about it out-of-character.
Finally I've noticed that a several posters overlook that wraithstrike is a swift spell. It should not be compared with spells with a standard action casting time. I may make a short list of equivalent swift and immediate action spells that are used in melee and what they can do. (Probably won't though since I'm getting tired of this thread.)