The top 100 list has already been posted, but I thought this article makes some interesting observations on the list.
Overall the variety of games and experiences on that list really show how versatile the deck is, and that people can still have a great time with games that aren’t a perfect experience on the deck.
The Verified tag is imperfect, and only means the game runs without any issues by steams criteria.
I’ve played plenty of games that get the next level down, “!” compatability warnings and it can be something as minor as the Steam Deck keyboard overlay appearing in game or even just the controller icons in the game not matching the icons on the deck or custom controllers. Having a 3rd party launcher can make the game not verified, even if the game runs flawlessly.
So not surprising that 30% of games are not verified.