wikipedia on the NSX:
http://en.wikipedia.org/wiki/Honda_NSX
"Despite the NSX's current age, it still has a strong base of fans and supporters. Honda and others describe the NSX as a supercar based on its styling, body type, drivetrain layout, and handling. Some people have disagreed, claiming that the Honda NSX is not powerful enough. Still, for a time, it sported the highest per-litre specific output of any road going naturally aspirated V6 in the world."
"Honda shocked the exotic car world when it introduced its NSX in 1990. Honda designers started with the basic exotic car wedge (championed by the Ferrari Testarossa and 308), that would remain basically unchanged for its entire life. "
wikipedia on what is a supercar:
http://en.wikipedia.org/wiki/Exotic_car
"The proper application of this term is subjective and disputed, especially among enthusiasts. In addition, the use of the term is dependent on the era..."
Performance criteria:
Power-to-weight ratio
Acceleration
Top Speed
Stopping ability
Handling
Styling
Focused design
wikipedias list of supercars.
http://en.wikipedia.org/wiki/List_of_supercars
Has NSX as a 'disputed' supercar is the same league as ferrari 360, porsche 911, etc. It looks to me like a 97 NSX is faster then a 95 Lamborghini, so I would say yeah, for its time, its a supercar... The trick is they made them for so long, it may have been a supercar when made in 91-98, but it wouldn't necessarly be a supercar when made in 2005?
So I would say its definitally an exotic, and up until the late ninties it was a supercar. Although I don't think something can be unclassified as a supercar when it gets old.
Honda calls it a supercar. I think TopGear calls it a supercar. Who else? I would love to see which magazines labeled it as what.