If it shoots like you want it to, has no problems, and is accurate tell them their argument is Fords vs. Chevrolets, ducks vs. chickens... I have a Bushie AR, like it fine but its like the Genuine Colts, the good many brands all seem to please their owners. Pay no mind to the "My dog is bigger than your dog" braggarts.
Shoot, do you like your rifle? Despite the signs, the zombie invasion probably won't come for another couple decades at least. If you find a problem with your rifle, get a different one, or change the upper, or whatever you want to do. The nice thing about AR's. You don't like something, change the part you dont like. Keep the rest.