How do you drive? Of course there is throttle lag when you punch it. This is fly-by-wire system. The computer will always do that in "D" since it is trying to get fuel economy. You are also in the low end of the power band of the gear. Try driving in "DS". The car will be much more responsive. Although I believe it is a safety issue, I think the issue is with the driving and not the car and how the car operates. You can also shift the gears yourself in any model of this car. If you don't like the auto, then shift it yourself. I think the auto is good for driving around town. If I am going to hall *** then I am in "DS" and I am using the paddles.
