I had Stadia too and played a lot of Destiny 2. I must say that I was highly impressed by the low latency. I literally couldn’t notice that I wasn’t playing locally, unless my internet went down.
Only when I took Stadia with me to a random airbnb did I start noticing any type of latency, and then we just played Mortal Kombat or other fighting games where you can just mash the buttons.