Which is dumb. "Headshot" shouldn't translate to "Aim at the air beside his head", period. Half the time, I see Sharpshooters owning Clots and such, but when Gorefasts and Skrakes come in, they assume that the weapons are weak because they can't 1-shot them or pop their heads because AIMING AT THE HEAD COUNTS AS A TORSO HIT!
That's why Shotguns and bursts from Auto weapons are often more effective at headshots than a freaking Sharpshooter weapon if you don't know how badly disjointed the hitboxes are...the fact that this hasn't been fixed after all these patches means one of two things...
1) Tripwire hasn't had the time and/or is utterly boggled by this and doesn't know how to fix it.
2) Tripwire knows, and is leaving it in to give "vets" an edge over new players.
Seeing as how they've done this before with both Skrake Stunning and Fleshpound Decaps, I'd say that number 2, although it's lame and frankly embarassing to have the headshot hitboxes so off, is what they're going for here...
A super-secret "insiders only" set of tips for the game, including stunning Skrakes, decapping fleshpounds, and getting headshots on Gorefasts/Skrakes, with all newbies being forced to learn the quirks of the game from the veterans or be absolutely unable to play. I really hope they haven't been trying to take the game in that direction as it'll turn into an elitist wankfest really quickly and alienate new players who are understandably confused that their "headshots" aren't doing anything.
And with this going retail, folks are DEFINITELY going to notice the horrible hitboxes in a big way. So if it's a technical issue, get it fixed, fast. And if it's not...re-evaluate why you're not fixing something that so blatantly needs it...