Nowadays, Linux runs well with Nvidia chips. Recent benchmarks show that open-source Linux graphic drivers work with Nvidia GPUs as well as its proprietary drivers.
No, they're not, and I wish people would stop repeating this. If you want to do anything in userspace, it's still proprietary, Nouveau, or NVK, the second of which has never been comparable and the third of which is still in development (though showing a lot of promise). What is basically at feature parity is the kernel drivers, which if the author had read their source, they'd already know. Kernelspace ≠ Userspace.
However, I will agree that even with the proprietary driver, most people will have a comparable experience to anyone with an AMD card. Hell, I can even use my old laptop with an integrated 960M to play the same games it has always been able to play. Linux has become more available to more people than ever, and it's only going to continue to get better.