Unless you are going to go to a racetrack and take on the new vette or vipers, you will not be disappointed by the horsepower. The car is still 5.0 sec to 60 and handles incredibly well. The NSX is very much improved from the 2002 model year forward. There are very few automotive reviews on the post-2002 NSX which is a shame because the driving experience is much imporved over the older car.
The clutch and the gear shift are easily the best in the world. Brakes are amazing. Interior leather is also a big improvement over the older cars.
Who would not agree that the car could still use maybe 75 more horsepower.