Coming up 6 months since trying Stadia I have now built up a fair games library:
F1 2020
Cyberpunk 2077
Far Cry 5
Assassin's Creed Odyssey + expansion
Destiny + expansion.
I've tried but 'returned'
Grid + expansion pack
Star wars Fallen order.
In total Stadia tells me I've spent over 150 hrs on it since end of June, that works out about 1hr a day, and most of that I suspect has been random 'free' time I've found in the evenings after finishing off work on the laptop.
Been really enjoying F1 2020 on the big screen since getting the 'free' Chromecast ultra, even at 1080p streaming it looks awesome on a 50inch OLED panel.
With a wired connection (via Powerlink adaptors), the gaming performance is essentially identical to my Xbox one but without the faff for updates or installs.
Total I've spent on games with Stadia stands at £150 including the getting the Chromecast Ultra+controller for 'free', not too bad really, £1/hr equivalent cost
.
Overall Stadia will 100% be my gaming platform going forwards. I got enough games to keep me going for a while now, but I am looking fowards to Hitman 3 - will pick up in a sales event probably next year this time.