Colt uses parts that only work in Colts and their quality control as been pretty bad for last the decade or so. Colt just coasts on it's name. Only old guys who were issued Colts back in the 60's through 80's still believe that the Colt name is synonymous with "quality." Besides the company who makes "Colt Rifles" for the civilian market is actually not even the same Colt company that was around back in the day. Colts are like Jaguar cars. Some people buy them for the name, others because they don't know any better, but the gun--along with the car--is mostly an expensive piece of junk making it's living off of "remember when."
Bushmaster is the gold standard because they sell the most AR's and everyone pretty much uses them as a yardstick to compare how well or how poorly they are doing AR's. Not just 8 years ago nobody doubted that Bushmaster was "the best." Most of the companies you buy AR's from nowdays didn't exist 8 years ago. Bushmaster has been doing it for 30. Noveske is a custom AR assembler, not a stem to stern manufacturer. Noveske is really more of a custom shop and I don't actually consider Noveske to be a "Brand." They are the guys that I take my Harley Davidson to to have tricked out; savvy?
Edit: Keep in mind, my take on a "quality AR" is to get the best quality parts or assembed rifle from an actual manufacturer, at the best price. These are civilian sporting rifles we are talking about, not "top of the line" weapons of war or competition. The car analogy works best. I'm always trying to put together, or buy the best Corvette sports car that I can, not a Ferrari, because a good Corvette is more car all by itself than most people can really handle. Ferrari's are for professionals. The sad part about it all is that most Soldiers don't even get as nice a gun as you would get with a standard, new, Bushmaster; ain't that always the way for Soldiers though. The PMC's have it better, but that's a whole different story. They often get the Ferrari's but even then sometimes not. Believe me, any of you guys want a nice Corvette at a good price. That's what you REALLY want and need whether you realize it or not.