Maybe, but what would you rather pass down your family tree; a Colt or Noveske, or a Bushmaster or Olympic?
I build my own that are better than most run of the mill AR15's by a large margin. Most utilize parts from a variety of quality AR15 manufacturers and subcontractors and get my own personal inspection, TLC, and in some cases, upgrading, refining, and refinishing, etc...
If I were buying one off the shelf, I prefer Noveske, LMT, and Stag Arms (in that order).
As for Colt, I use some of their parts in my builds. I would never buy a complete Colt off the shelf though. I absolutely hate their non standard parts, don't want anything to do with them. It hampers my ability to swap out and keep spare parts in standard configurations.
Although I believe a Colt is gonna be nicer than your average run of the mill Oly, I have seen Olympics run just fine through carbine courses while Colt's have choked. This is the exception to the rule, but I have still seen it happen. I think that people's own maintenance and care for their rifles have something to do with it. Some people don't know how to maintain firearms.
Also, many people fail to recognize that many of the lower tiered AR15's (if that's what you want to call them) can be quite serviceable if they are upgraded and maintained well. It wouldn't even be that hard to take a plain old Olympic or Armalite and make a few modifications that would increase their ability to perform with the big dogs.