You probably also heard that Olympic Arms is junk too, then?
I have owned both DPMS and OlyArms (still have the OlyArms), and have had zero issues with the quality or reliability of either. If you want to spend your money on a "tier 1" AR-15, by all means, go ahead - those companies make good rifles and components. But this propagation of info that other companies make an inferior product has been completely disproved in my experience, and the experience of people that I personally know. To me, it seems like an internet, mine-is-better-than-yours, penis-size contest as to who can afford the best components for their safe queen. Just because I paid less than half of what a "tier-1" rifle costs, doesn't mean mine is inferior.