Keep in mind that gun magazines sell ad space. The companies that buy more ads, just might get a better rating that something else. Not saying it's rampant or anything, but I've seen some reviews of guns that get glowing reviews, yet the QC on some have been less than exemplary.
Probably the best decision making help I've received was from a chart made by a member of m4carbine.net.
THE CHART
Keep in mind, this chart is to help people buy the best AR for their task. If you're a 'once in a while' shooter (200-500 rounds a year) you may never have an issue with an AR from any number of manufacturers. On the other hand, if you shoot 'em harder like I do, (7000-8000 rounds a year), you may want to pay more attention to the little things.
I've owned a couple different Bushmasters over the past 12 years, and they ran pretty good, with the occasional feeding problem and other small issues, but since I've bought my Noveske, I've not had a problem one. Most of the small intricacies won't ever be noticed by someone who doesn't shoot all that much, but hell, I look at guns as an investment, long term, so a little extra now that might save me a headache later... is worth the extra scratch.
If I buy another AR, it'll probably be a Noveske or a Colt, but that's only because, at times, I have more money than I know what to do with. (stressing - at times)