Compared to nothing. I have used Nvidia graphics cards under Linux for many years. The last one was a GTX 1070. In order for the cards to work, I had to install the driver once with the command pacman -S nvidia-dkms. So the effort was very small.

Kernel modules work until they don't. I'm genuinely glad that you've had a good experience and -- despite appearances -- I'm not interested in provoking a vendor flamewar... but the fact remains that among the three major patterns (builtin, userland, module), modules are the most fragile and least flexible. I'll cite this response to my parent comment as an example.

Unfortunately, when it comes to Nvidia, many people do not judge objectively. Torvalds’ “fuck you”, for example, referred to what he saw as Nvidia’s lack of cooperation with the kernel developers. And i think he was right. But it was never about how good or bad the graphics cards were usable under Linux. Which, unfortunately, many Linux users claim. Be it out of lack of knowledge or on purpose.

That's a fair point, but to a certain extent I think this overlooks the importance of developer sentiment on a project like Linux. Take (Intel) Macbooks as an extreme example: kernel developers liked the hardware enough to support it despite utter vendor indifference. It's clearly a case of hypocrisy compared to NVIDIA who (at the very least) participates, but at the end of the day people will show love for the things that they love. NVIDIA remains unloved and I do feel that this bleeds through to the user experience a fair amount.

In any case, you're right to say that legitimate criticisms are often blown out of proportion. Developer problems aren't necessarily user problems, even if we sometimes romanticize otherwise.