There are two ways to play pc vr games on quest. First is via wifi, with apps like Virtual Desktop, this gives you very good quality, but depending on your setup can range between perfectly acceptable latency, or terrible jittering and lag.

Oculus link gives you very good latency, but with the default settings the quality leaves a lot to be desired. You can tweak the render settings though, which fixes the issue, and it ends up looking about as good as Virtual Desktop. Only real unsolvable problem is the cable, but it's not a huge issue for me.

Alyx is quite playable through both of these setups (assuming good latency for a virtual desktop setup).