What do you consider "good performance" of a game on the deck?
Just curious what do people have in mind, when they say a game is "working great" or "perfectly". I believe I'm in the minority, but I just can't enjoy a game under 45 FPS, or if the resolution has to be under 720p and the UI/text is all blurry because of it. Perhaps it's because I'm used to playing mainly on PC. Still enjoy my Steam Deck a lot though, even if it can't keep up sometimes.
I'm perfectly fine with 30fps, my biggest concern is battery life. At 30fps I don't really like to see a game go much higher than 15-16w of draw. Lower is even better.
Any game in that range can be pushed harder (higher fps, higher graphics quality, etc), but at that point it's up to the player whether they want to prioritize battery, graphics, or smoothness. If you go above that threshold there usually isn't much room for player choice in how they want the game to run.
Yeah I don't usually play for more than 2 hours so the battery is not really that much of a concern for me like it is for others. But my sweet spot is usually 50 fps for more demanding games considering the battery/fps ratio. I don't like to overheat my deck unnecessarily.