First - EVGA 9800gt;
The temperature sensor on this burned out so my dad gave it to me and got himself a new one.
It was crazy loud with the fan running at 100% so I used Rivatuner to manually control the fan.
Eventually I turned my computer on one day and it just wouldn't boot, it was dead.
Favourite - Sapphire HD7770;
This was the first graphics card I used that genuinely surprised me, the performance it gave for the money was unbeatable.
Even at 1080p it held up for quite a while running games at high settings, eventually I took the bite and upgraded.
I gave my entire old rig to my friend, he runs it at 1366x768, and it keeps up with my R9 280x on otherwise max settings.
Worst - Asus HD6570;
I hated this graphics card so much. It had a tiny little fan that whined a high pitched noise from the first time I used it.
It replaced the 9800gt I had, but it wasn't quite as good. It lagged slightly behind by about 5 -10 fps.
So from day one it was disappointment, but I put up with it for gaming's sake. Eventually the fan stop spinning suddenly.
I ordered a new fan online to replace it, but when i tried to take the old fan out, there were these tiny, and I mean tiny, screws.
When I tried to unscrew them the entire head of the screw came off, on every screw. No matter how gentle I was.
I already hated the card, and this annoyed me so much. Enough, I just threw it away and moved on.
I still have the replacement fan.