For me, the fact that Cosworth was involved with designing/building the heads and block was a plus for me. But, I am not a Hondafile purist. I did own a 1984 accord for 2 years that was totaled by hail..... I raced vintage formula cars for 12 years, and I am well aware of Cosworth's historical contribution to the racing world. The Ford Cosworth DFV V8 Formula 1 engine was perhaps the greatest and most successful racing engine built by man.
We know that Honda targeted the Ferrari 458 when building the new NSX. I imagine that as the development process was delayed and delayed, Honda got behind, and brought in Cosworth so they could focus on other things.
I have always felt that the NSX was "meant" to be debuted perhaps 2 years earlier than it was, and the 573 HP would have been much more significant. By the time the NSX came to market, the 458 had morphed into the 488 with over 600 HP. The NSX, with regard to HP, was almost obsolete the day it was released? Since then, there has been a major escalation in factory HP. Now cars are routinely sold from the factory with 7-800 HP. Crazy.... Where will it end? How fast is fast enough?
Honda could have easily built a 3.8 L engine with bigger turbos, and bigger electric motors, and could easily made upwards of 700 HP. So, why not? First, I think Honda felt the car was fast enough, and they were trying to maximize the 3.5L they had. Second, I firmly believe they were being conservative, as they have to warranty that power..... As HP goes up, reliability goes down.
But the car is fast as is...... it is different, and unique, and at $43K off sticker, I jumped, thinking it was a supercar bargain. I have not been disappointed.......