I'd try to stay away from Olympic Arms, DPMS, Bushmaster and a couple other odd ball brands.
You have every right to your opinion but Bushmaster has been making the AR style rifle longer than any other manufacturer except for Colt. I would hardly call that an "oddball brand". They have been in business since 1976 and are still doing quite well selling what you call a hobbiest grade rifle. Strange that so many PD's would depend on a hobbiest grade weapon.