Not ATM, there's also a fuss about using closed source drivers/components.

Wine is major performance and feature hit since it attempts to translate DX API calls into OpenGL, many of the commercial GameOnLinux solutions are technically wine with slightly better profiles.

Engines with dedicated Linux support are still well kinda messy, graphically wise they might still have to make sacrifice mostly because OpenGL was in a political limbo for a decade and didn't kept up with DX graphical API.

But the biggest issue in many games for me was actually the controls, audio, and network code. DX is much more than just graphics and OpenGL doesn't cover audio, controls and network code. So unless your engine has discrete code to deal with that e.g. uses Steam Workshop or what ever Unity calls their set of API's you'll get quite a shitty experience.

I use OpenGL on nVidia proprietary on a GTX 660. I run many Steam games and some of them are Unity: 7 Days To Die, Beasts Of Prey, Dying Light, Metro Last Light, they all run great. In past years back when I ran Windows XP for games and dual booted into Ubuntu I ran Unreal 2004. One day it crashed (as it did sometimes ending in the BSOD) then I booted into Ubuntu and ran the Linux version and it ran faster and smoother and never crashed. That was the moment I decided it was time to go full time Ubuntu Linux.