You can now filter Steam reviews to show those who "played mostly on Steam Deck"
Valve have their own rating system for measuring how games run on Steam Deck, but even following the guidance of whether something is "Playable" or "Verified", I've still run into games that simply do not work on the handheld device.
Enter Steam reviews. Reviews from players who primarily played on Steam Deck will now have a little Deck icon, which when moused over tells you the exact amount of time spent on the Deck.