Leaving out Boomer Shooters which play great
I have tried
-Titanfall 2 pretty good until EA App updates and you cannot get in. Limited story content -Call of Duty infinite Warfare Pretty good as well but that 97 GB install is annoying for whay you get -Halo MCC Fully customizable on how big the install is and wide selection of things -Wolfenstein. Didn’t seem to click for me.
Right now my pick is Halo MCC but does anyone have anything else they liked on the deck? I was thinking about finding a new FPS to play on it.
Warframe
I’ve heard Borderlands 3 runs great
WH40K Boltgun. Boomer Shooter, I know. Worth it though.
TF2 should be all fixed - you don’t even need community server support patched in.
Overwatch 2 is my go to game for FPS/shooter.
You could try Call of Duty Black Ops 4 - it is the last COD that works on Deck (outside of sailing the high seas).
Stalker anomaly mod works great if you’re comfortable with some tinkering/setup. It’s been a while since I installed it but I recall following a guide from this subreddit and finding it not too difficult to get working. If you want a gritty realistic open world single player fps there’s not much else that tops it imo.
On the other side of the single player fps spectrum, the borderlands games all seem to work well enough.