All I can tell you is this:
I was very much the same way. I had a G17 in 1990 or so that was a huge pile of crap. A true lemon. Lots of problems and I sent it back to then twice and still it broke and jammed and just wasn't a good gun. It soured me on Golcks for a long time.
Fastforward to Feb. of this year. I had read several of the tests where they treated a Glock in a manner that I would never trat a gun. Any gun. Even a HiPoint. And I was impressed. And it made me start thinking about giving them another chance.
So, I took part of the tax refund and bought a brand new G23. And good God do I love this gun. It is more accurate than any gun I have ever bought and it just tough as hell. The grip still doesn't fit my hand as well and an XD but, I know it is NEVER going to rust, the gun is so accurate it isn't even funny and there are so many after market parts for Glocks that it is amazing. And, EVERYONE who makes holsters of any kind, makes holsters for the Glocks.
So, I can tell you I am extremely happy with my new Glock and I am already saving to buy the G27.
I'd give them a second chance.