As a GFN user for the past 14 months I disagree. It's more than acceptable performance even when playing competitive multiplayer games like League of Legends and Planetside 2.

I do agree however that Stadia sucked as a product. Nobody was going to buy into their ecosystem if they can't opt to download the games onto their own PCs like Steam. Too much lock-in without that aspect, and without any guarantees that they were going to refund customers if Stadia ever sunk it just made it DOA