For me it was a mobile card, the GTX 480m. A GPU so hot and leaky it had no business being put into a laptop, you essentially needed two power adapters to avoid shut downs at high load on the few latpop models (I think Clevo/Sager and derivatives and maybe a small number of AWs were the only models that sported it). It was so bad nVidia replaced with a revised, cooler chip, the 485m, literally months after the 480m was released.
FX5600 was bad, but it wasn't that bad. I had one and it played current games adequately to well. Its problem was it was noisier than other cards, and importantly, it was completely blown out of the water by the 9700.
Same with Radeon VII. It was a decent performer for the time, albeit hot and unstable in some circumstances. It got a bad wrap.