I have not completed any game in deck but occasionally played quite a few game from time to time. According to me any 3rd person, platformer game works great. I would stay away from competitive game. Other than that you will really enjoy it. Use chiaki4deck and download proper controller profile and you are good to go

My setting: 1080p

30000 video bitrate

19200 audio bitrate

H265

Hardware decode: vaapi