There are many reasons to dislike Nvidia on Linux. Here is a little thing that bugs me all the time, the updates. Normally the system updates would be quick and fast, but with the proprietary drivers of Nvidia involved, it gets quiet slow process. And I am not even talking about any other problem I encounter, just about the updates.
As an Archlinux based system user (EndeavourOS to be precise), I get new Kernel updates all the time. That means every time a new Kernel version is installed, the Nvidia driver DKMS has to be installed too. And that is basically the slowest part. But that's not too bad, even though it's doing this twice for each Kernel I have once.
What's more infuriating is, if you also happen to use Flatpaks for a very few applications. I really don't have many Flatpaks at all. Yet, the Nvidia drivers are installed in 7 versions or what?! And they are full downloads, each 340 MB or more. This takes ages and is the only part that takes long to update Flatpak system. I always do flatpak remove --unused to make sure nothing useless is present. /RANT (EDIT: Just typos corrected.)
I would call that an exaggeration. It's not perfect sure, but it has finally improved a lot in the last year and it works for some. I had to get a new gaming laptop earlier this year and the only good option I could afford had an NV card. It was a great deal from Bestbuy certified open box, $500 off (I love those open box deals with 30day return).
It works well, I play Guildwars2 and BG3 flawlessly through XWayland+proton with great performance. Maybe it works well because I put it into Dedicated Nvidia mode, instead of using Optimus? (I never liked Optimus)
Sure it's not perfect, I get graphics glitches in KDE if bringing the laptop out of sleep, funny colors and a mouse with a funny trail, but I don't need to use sleep, I boot it in the morning and shut it down in the evening, it's no biggie for my use-case.