I must admit, when I got my 144hz monitor I was excited, coming from a 60hz monitor. But even if a game runs at 144 fps I don’t see much of a difference, many people do, but I don’t. It’s a bit smoother, but not much.
But if a game runs at 30 fps it’s horrible. The Crew, for example, can be switched to 30 or 60 fps, that’s night and day!