Sir i would say thats how a turbo charged vehicle bahaves, as you would notice that the turbo kicks in around 1800-3500 RPM, so for optimal performance you need to keep your vehicle in that rpm range. You should not be facing any issues of overtaking or loss of power in this band width. This is not an issue but the the characteristics of the car. Enjoy the turbo.
One thing for sure in future I am not a Tata Buyer.