Uh, yes it is. It's just not complete 1:1 for your actual swing, because if so that would be so fucking incredibly hard. It's 1:1 for the beginning, your serve, etc. Motion+ senses the nuances of your wrist twisting or flicks, where you shoot towards, how hard and fast, etc.
It's much closer to 1:1 than you're letting on. Tiger Woods is just like this, as well. If it were true 1:1, which is possible but devs incorporate a sort of relief, your character would be bugging the fuck out