So essentially it's just been reiterated what has been well known for the last couple of chipsets. You're not getting any significantly higher performance (maybe a 100-200MHz, or slightly lower voltages for the same frequency AT BEST) from these expensive boards over cheaper ones.
If anyone is buying a board today because they think they're going to get noticeably better performance out if it, which is what his review essentially revolves around, then your sadly mistaken. Also, not all brands are going to OC the same way either, manufactures do tweaks within the UEFI that changes how the mobo handles the CPU as well as the huge number of variables you can adjust. There's things that need to be done slightly differently between mobo M, mobo G and mobo A, especially when your trying to hit ~4.8GHz on Haswell.
But even if the M6E did perform better than board half it's price it would be by such a small margin (just like the difference between every other Z68 (less so), Z77 or Z87 board) that there would be no tangible, real world performance difference anyway.
My point being, even if it slightly out performed the other boards it should still be getting a "Bronze" award. And by this standard so would the highest end Z87 MSI or Gigabyte boards, because the few hundred points more your getting in synthetic benchmark X or Y doesn't justify the even larger price difference. No "Performance" awards here, something like a Titan deserves that (shitty price: performance, but still quiet a bit better any other single GPU at launch), not the extra (maybe, if you're lucky) 100-200MHz or 5-10degrees C cooler from lower volts (during OCCT runs, which are so far off real world use anyway) here or there that means nothing.
Buy a board because of its features/included software or if you're willing to pay for a particular colour scheme/look. Not because its a called a ROGXpowerOCForceSniper-Super-Overclock-whateverthefuck and therefore you'll get moar gigahertz. If you're buying any motherboard for performance, unless your benchmarking on LN2, you probably got more money than sense.