I think I put 70-80 hours into it and found it quite good and bug free. The one nVidia setting for the better ready traced lights was the only issue and turning it off solved all the issues.
Stealth was fine, but the rocks were annoying for sure. I think the biggest issue was not selling it on steam and the terrible Ubisoft launcher.
I saw that too but that one setting fixed it for me completely. Plus I use frame gen with a vsynced FPS at 119 (to prevent tearing).
I’m also using a 4090 with an overclock 10700k.