Racial feat design

One of my favorite racial feats in the game right now is Hellfire Blood.  By itself it isn't all that special, but what it does to the game is what I think several racial feats should do.  It makes Tiefling worth a second look for any class regardless of whether they have the proper racial stats for it or not.  Maybe they end up terrible anyways, but the fact that the entire class roster is open to them despite their pure mental stat layout is far more interesting than the majority of racial feats out there.

I understand that as a game designer you don't want to spend forever making a feat that only a limited number of players will ever use.  That said 90% of racial feats are frankly not worth a feat slot.  To add to that I understand that overpowered racial feats draw away from other options so undershooting does less damage than overshooting.  There is a Tiefling feat that could go several sessions without ever seeing its relatively marginal benefits come up once called Cunning Ambusher.

On the balance level Hellfire Blood only works with fire attacks, which a flaming weapon deals with quickly.  But using a flaming weapon removes the option of the dreaded frost weapon or even the lesser powered (without building/party building) lightsaber (radiant weapon).  What it does do is very closely emulate a +2 to an accuracy stat.  If other races had feats of similar scope to Hellfire Blood 4th edition almost certainly would be a more interesting game.  Copy and paste with necrotic for revenants/shadar would work just as well.

On the other hand I feel sometimes that Draconic Arrogance and Elemental Empowerment do too much.  Any wizard who wants to pretend he is a striker is better off as a Genasi than any other race by a long shot.  Several classes (fighter in particular) would rather be a Dragonborn than any other race because of a single feat.  These make the game less interesting.  In stead of opening options they close off options by outdistancing alternatives by so much that they seem useless.  People may feel that they are limited enough in their use that they don't break the game and I understand the argument, but I can't help but feel that I never consider any race other than Genasi for wizard (in my powerbuilding thought experiments) and the Dragonborn Iron Vanguard is a beast defensively and offensively.