Fair enough. All I can say is that all the G&Gs I've used have been excellent and reliable out of the box. I've not had the feed issues but then I don't use G&G midcaps (I use Dytacs - a magazine that again, plenty of others have criticised but I've had no issues with and neither have any of my friends that use them).
No manufacturer is perfect, I understand that (even TM make lemons) but there is a reason as to why G&G are so highly regarded by so many people. That's not to say that a decent CYMA AK can't outperform and outlast one for half the price but that by itself doesn't make the G&G a bad gun.
I've run my G&G SCAR plenty and it's been nothing but reliable and accurate. Between my close player mates there's two TGM A5s, a CQB mini, a GR4 G26 advanced, an F2010 and a T418 and they've all been absolutely fine. I can only speak from experience the same as you.