First game I installed on the deck was Rage and it was a texture mess.
Installed Windows instead of the SteamOS and never looked back.
windows is coming out with a handheld OS to help steam deck out I think in a year or so probably. we will see how long we have to wait.
I know it sounds weird, but 60 fps on my Steam Deck doesn't look like 60 fps on my PC. I wonder if Arch Linux has some kind of "frame smoother" built into it.
Some games don't work well on Steam Deck, and you just have to forget those. Dishonored was a 10/10 experience on Deck for me, ironically on PC Dishonored had screen tearing issues for me even with FPS cap on.
So some games I enjoy more on SteamOS than I do on Windows... wild times.