Stadia was amazing, what made no sense is the business model. They should have operated like GeForce Now. You could have paid a subscription only to run the games in the cloud and buy the game on separate shops.

I played Stadia, then Xbox live, then PC and the truth is it really depended on your geographical location and router. Almost all casual fps have some sort of auto aim built in, the ones that did not were unplayable but the ones that did were pretty good

I found it really responsive, just playing platform games on my phone.

I'm guessing part of the problem is that some folks internet just couldn't handle it. I tried GeForce NOW and Stadia and Stadia felt miles ahead in responsiveness.