Even though I have a few of the same brands they were comparing in that article...I've never been one to buy just because so-n-so said so, or because that's what this Spec-Op/LEO Swat/Secret Service/etc, etc. team is carrying this year, or because whatever reason.
I do read the material that the manufacturer's put out, to see what they used, how it was used, etc. As for performance, the only test that I would rely on, is the test that I would put it through, myself. I want to know how the gun reacts with how I handle it, the way I normally would handle it, how I shoot, what I load it with, what I choose to put in it and on it. Anything that anyone else has to say about it, that's fine. I will always listen - but I choose whether or not to hear.
For newbie's to the AR, sometimes that's all they can do is read and listen to what the experienced folks have to say. This isn't necessarily a bad thing, since you really don't have any practical knowledge to go by - yet. But as you gain that experience and knowledge, you will soon be able to read THROUGH some of the write-ups and comparisons, and make the right choices for yourself.
As for the article, eh...it's okay. But let's see a side-by-side, actual comparison, in the field, with a variety of ammo, fired by a group of unbiased operators, and put all the brands through the wringer. It's easy to sit back and say that this one or that one has all these attributes checked off, so they must be good, right?
Oh well...just my .02.