I've been watching various AR boards for several years and I've noticed "the best AR" changes with what's en vogue at the moment. Two years ago Rock River was the AR and if didn't have one you were... A) an idiot for not owning something better and cheaper than Colt or B) taking your life in your hands with anything else AKA "junk".
This year it seems the pendulum has swung to LMT or Noveske or Spikes Tactical as the best AR and RR has fallen from grace. What brand is next slated to be "the best AR"? I suppose it won't be Colt or DPMS or Olympic.
I think you're not understanding the way the market works.
During the ban there were only a handful of options available. Armalite, Bushmaster, Colt, DPMS, Olympic, and (towards the end) Rock River. Colt suffered some QC issues during the ban, which allowed Armalite and Bushmaster (and later RRA) to be seen as equals offered at a lower price. Colt was also having production issues which led to scarcity which also drove the price up. So, during the ban you heard things like "ABC" for "Armalite, Bushmaster, and Colt", which was often later amended to "ABC and R" to add RRA to the mix.
Near the end of the ban, Colt started getting back on track, and they started offering products in their civilian and LE lines that were every bit as high quality as what they sell the government but with semi-auto FCG parts. When the ban ended, this led to the 6920 being the holy grail of ARs, and the Colt products were now offering something for that extra cost in terms of materials, QC, and assembly that "ABR" weren't.
With the ban gone, the market opened wide for smaller companies to start offering a wide range of products, and the first of these was really LMT with their uppers only. Their uppers had all the right materials and QC, and were just missing some very small assembly issues that would never affect most owners. Then along came Sabre, Noveske, and more recently S&W and Charles Daly that were offering products that were either better than the Colt and were priced accordingly, or were better than "ABR" and priced the same or less.
So, at one time the "ABR" choices made sense. Yes, they weren't to the level of a current-production Colt, but then neither were the Colts at the time, and they cost less anyway making them viable economic choices. Fast forward to today where you can get a better Smith and Wesson for the price of a Bushmaster, a better Stag for the price of an RRA, or a better Charles Daly for the price of an Armalite, and these older established brands that are resting on their laurels no longer make any economic sense as purchases. For every one of the "ABR", I can now get an equal product for less money, or a better product for the same price. If you can buy a Lexus for the price of a Toyota, why would you buy the Toyota?
Notice that I left off brands like Olympic, DPMS, Hesse, etc. These brands have always served a function, which was (and is) to offer a low cost alternative with materials, quality control, and assembly standards to match. If someone is on an extremely limited budget, is looking for a low-cost plinker that looks like the current issue military firearm, and wants a platform on which to bolt crapco accessories, then these brands serve that niche. This is why Pat Rogers refers to these manufacturers as "hobby guns". They are there to fill the niche of the hobby shooter market. Kind of like a V6 Mustang or Camaro, they may look like the real thing, and if all the owner wants is the style of the real thing they may suffice, but they are not the same thing. Personally, I think the best sub-$800 AR is an AK, but YMMV.