Sounds normal to me. Most cars nowadays are drive by wire for the throttle and all drive by wire vehicles have some throttle lag, which is especially noticeable in the lower RPM band.
As suggested, go test drive some others to see if it does the same thing, but chances are it is normal. If it bothers you too bad, I would suggest looking into a SprintBooster or equivalent mod that helps in making the throttle respond better to driver input.
Drop a gear and disappear!!!