Any noticeable latency and I won't even give something a chance to try it. Needing to send my inputs over the internet, wait for them to get processed, and then have the video output streamed back to my local setup means even a small amount of latency. 40ms (which is what I expect for my connection in online gaming servers) would kill the experience of many games, especially rhythm games or other high-reflex games like the entire fighting game genre. Some stuff like Turn Based RPGs could possibly benefit from cloud gaming for users with underperforming hardware, but that's it. Strong No Thanks F*** Off from me when it comes to cloud gaming.