I do all my gaming on my Steam Deck and I haven’t run into anything that didn’t work – even “unverified” games. But I also eg. don’t play any multiplayer games so I don’t have troubles with anti-cheat systems which are apparently still a big pain point for Linux gaming and might be one reason for your bad experiences
Few games? Man, you and I are definitely having a different experience.
I do all my gaming on my Steam Deck and I haven’t run into anything that didn’t work – even “unverified” games. But I also eg. don’t play any multiplayer games so I don’t have troubles with anti-cheat systems which are apparently still a big pain point for Linux gaming and might be one reason for your bad experiences