Yes, playing a FPS from the cloud is not the best idea we can come up with, even if I logged on my EVE account to be 100% sure that Vanguard is not available on GFN.
Yesterday I was not affected by latency, but tried 20 minutes ago and network was bad. Anyway, for doing stuff other than PVP to enjoy the game in full graphics details without getting your computer fan blown away, is not bad, the service is improving.
Another example, it’s actually the only way for me to enjoy Baldur’s gate, and I feel impressed on each session. I really like it.
Some words about security: launching a game on GFN open a session on a VM and this session is destroyed when you close your game session, this is why you have to login again each time on new session, and I expect every players to have set up their 2FA on their games accounts. I personally feel secure there more than in our real world 
