i haven't tried stadia, but i have tried sony's alternative (PS Now) with a couple games. i'm a pretty casual gamer, and was playing some pretty casual games (grand theft auto, some car racing sim, and something else i forget), i'm not going to be as sensitive to latency as a lot of people probably, and it was completely unplayable for me.

i guess it must work for some people, but my 100Mb canadian internet was definitely not good enough.