My $0.02 worth ...
The OTHER gunrags get a finely tuned gun from the gun maker who knows that the gun will be reviewed for publication. Therefore, chances are, the particular firearm that they get to test will be the best that that particular model can be. Additionally, you have to keep in mind that advertizing dollars also influences how the final review is written. I'm not necessarily saying that the author purposely making the gun sound better because of ad money but I am saying that before the final articule appears in print, the advertizing money played a part someplace along the way.
I recall a couple of years ago a gunrag did a negative review of thunderwear and the president of the company wrote in to voice his displeasure and say that he was ending all financial relations (running ads) with the gunrag. The bottom line is that gunmakers are the chief advertizers in gunrags and gunrags don't want to piss them off.
So you have a gun being reviewed that is the best that it could possibly be plus the ad money factor and you SOMETIMES have a review that bears very little to how the firearm really is.
GUN TESTS, on the other hand, accepts no ads and buys all of their guns themselves. As a result, what you see is what you get. Of course, they could get stuck with a lemon in an otherwise good model line or they could get "stuck" with a good gun in a normally bad model line. But if you go with the laws of average, chances are the quality of gun that they get will be the same quality of gun that you get.
I agree that GUN TESTS will SOMETIMES unfairly nit-pick a gun because of one minor flaw but they usually identify the reasons why they are giving it a poor rating and if that is a feature that is not important to you, then you can act accordingly. I recall one particular review that they did on compact 9mm's and one of the guns reviewed was the S&W CS. The other guns were DAO and they gave a S&W CS a poor rating because of the difficulty for shooters to go from DA to SA mode where as the other guns did not have that "problem". Well, I've been shooting DA/SA pistols for nearly two decades and going from DA to SA is not a problem for me so I just ignored that particular comment.
GUN TEST is not CONSUMER REPORTS but since CONSUMER REPORTS does not test guns, GUN TEST is the cloest PUBLICATION to a Consumer Reports for guns that we have.
FUD
Before anyone asks, No, I do not have any financial interest in GUN TESTS or am I in any way associated with them. I'm merely trying to share what I know. And, Yes, despite my negative comments, I do buy gunrags not so much for their product review but to keep up with things -- I hear & see all of the news on radio & TV but still buy the Sunday paper.