Looks/Style:
It doesn't have the sleek lines that exotics usually have. It doesn't have the low slung mean demeanor that you would have in exotics. It's a giant brick with power. It looks nice, but not as jaw dropping or eye catching as a F430 or Gallardo. Exotic cars usually represent elusiveness and desire and that should show in the style of the car. GTR doesn't really ooze that either.
Performance:
It should be able to take a corner as if it's on rails. Stop at the drop of a dime. Take off as if it were a fighter jet. Okay so not to those exaggerations, but it should definitely be a something that would destroy most normal cars on the road and maybe even edge out most supercars of today. Yes the Gallardo probably will get eaten up by a GTR in some places, but that just shows how powerful and performing the GTR truly is. But an exotic should be able to be put on a track and feel right at home.
Rarity:
It's a relatively new car. Given that there are already a number of them in Toronto and Vancouver, and I'm sure Edmonton, Calgary and Montreal are housing a few. (Ottawa I believe has 1, but I don't know for sure). Either way, after a few years, this car will be sold used for pretty cheap. (It is said that less than 8000 should be produced each year (wiki rule of thumb))
Price:
Exotics are expensive. They're pricier to maintain and keep. The GTR from my understanding does fit this bill. However it's base price alone doesn't really set it high enough to be considered a exotic.
Heritage:
The car should come from a long line of other supercars. Miura's and Espada's weren't considered Exotic's then, but definitely the elite of the cars. I believe that eventually cars without heritage, supercars will become exotics over time. (McLaren F1, Koenigsegg CC, Pagani Zonda). The last two are the best supercars of today but once the company builds a reputation they will become exotic. I feel heritage is an issue as it has the appeal, the worth, the want of it. People can see a car and want it, but people who don't know cars see the car and absolutely know what it is. It is well known. Lamborghini, Ferrari, Bentley, Rolls-Royce. These four all have heritages and even though someone may not know cars, they know what these four are. Nissan doesn't really have this, the Skyline may have had it, but the GTR definitely does not. This may include racing heritage, but usually does not.
For Exotic after thinking about it, I believe it falls down into these 5 categories. (Obviously this will be disputed)
Although the GTR fits the performance and rarity criteria, I don't believe it passes the other three.
Supercar: Definitely.
Exotic: No.
P.S. No. I don't consider the NSX, Ford GT, Dodge Viper, Chevorlet Corvette to be exotics either. Great cars, and the last 3 are definitely supercars, but not exotic.
If it is not exotic, then why it is in Meadowbrook Concours d’Elegance-the exotics.
http://www.nsxprime.com/forums/showthread.php?t=125986
Because at the same time, it would look weird next to cars where it just destroy's in terms of performance. Even though it's not an exotic you'll park it next to exotics because that's where it sits. Similarly you'll park Corvette's, Vipers and NSX's in the same spot. They have some of the qualities in the end, and you'll tend to park it next to it's competitor's. The GTR's competitors for the most part, save a few, are mostly exotics.