I guarantee you if I drive a Z06 and barely touch the throttle, you will know no doubt what is coming if you hit it. I think thats what the OP meant. He was driving normal and it felt slow, completly different if you drive a real exotic like a ferrari or a z06 as you know it has power without even getting on it. Again, the NSX is not a power house and thats OK as thats not what it was meant for.
The NSX is not a torque monster, if you are used to driving cars with lots of torque then an NSX will always feel slow even if it's actually faster as it just pulls constantly but with a lesser amount of torque, where as other cars will pull to a certain point and then run out of air and the torque drops off...area under the curve could be the same but one will "feel" faster than the other.