I've never had problems with Blazer, Sellier & Bellot, Georgia Arms, Blazer Brass, or PMC
I don't find those around me. Again I've never had issues with American Eagle. If you have that's your own experience and I won't discount it, but it doesn't match mine.
Edit: I can't remember if it was you but I remember a similar conversation with someone over a S&W 1911. That person was also dead set it was the ammo. A trip to S&W and it came home running like a top on anything I could feed it. I don't find most production ammo to be junk, it's usually okay.