Almost everyone I know knows Acura is owned by Honda and most of them can't even change their own oil. They don't mistake it as some other car, they just say it's a Japanese car and ask if it has a 4-banger.
We must not have the same friends. My non-car friends can't stop talking about the claimed fuel economy of the Accord V6. Do the same friends ask if that Focus over there has a V8?
People also stop and look at the Chevrolet SSR, doesn't make it cool. I would guess most of the people who stop and look at an NSX are thinking "What the hell is this?", which again doesn't equal cool.
You read minds, too? See, now you're coming up with theoretical reasons why it's not cool.
Regarding the numbers; A Diablo had power of between 492 bhp (the early 5.7l) and 595bhp... a match for the F40's 478.
And yet it's nowhere near anywhere as fast as an F40.
Here's the thing: If you point at one supercar and say: "Anything slower than that is not a supercar", you're creating your own definition. A Bugatti Veyron hits 60 mph in 2.5 seconds. Does that make the Enzo, the Porsche Carerra GT, the Zonda and everything else in that category "non-supercars"?
The fact that the Mclaren F1 came out in the mid-90s with acceleration and top speed far beyond anything else before it doesn't automatically make the XJ220 or the Bugatti EB110 non-supercars.
By today's reckoning, the F40 is still "average" for a supercar... which is why we still consider it one. But when it came out, the F40 and the Porsche 959 were hypercars. Performance well above and beyond supercars of their time.
Nowadays, a 959's performance is comparable to a mere 911 Turbo. And an F40 isn't any more powerful or quick than a Nissan GT-R. That doesn't change the fact that in their time, they were the top-of-the-heap amongst supercars.
You can argue the
exotic angle (warning! entering motoring geek zone! Non-car people run away) because the NSX doesn't have the badge, doesn't have the exclusivity, etcetera... but many people consider it an exotic.
It has an exotic shape: check.
It has exotic speed: For its time, check. (the Countach, which went out of production just a few years before the NSX bowed in, gave similar performance numbers... with 100 horses more).
It has an exotic price-tag: check.
Those are things that non-car people can understand. To convince them of how uncool it is, you first have to explain to them that it's a Honda. Then you have to explain to them, somehow, that the NSX's exotic construction and performance were not as good as other supercars... of course... there's hardly any way to do that part completely objectively...