I recently purchased a 2013 GT-R, as I've never had one and thought it might be interesting, and with Blizzak tires, usable as a winter-beater. Driving AWD cars with some power in snow is about as fun as anything!
The GT-R's weak sales are a function of alot of things, I think, including
-alot of misleading hype and spin piled around the car by Nissan, which puts off alot of people
-almost total lack of recognition on the road, nobody knows what it is when I drive it, its as invisible on the road as a regular old nice car.
-alot of concern and hype around Nissan warranty voiding and other shady practices
-lets be real, while the car is very interesting to look at and striking by itself, when surrounded with other supercars its plain boring to look at.
Its performance is nothing mysterious, in a straight line that wild 0-60 time is a function of extremely low gearing and AWD grip and a very very well sorted launch control function. Its the low gearing that makes it fast.
It feels no faster than a C6 Z06 from, say, 35 mph or so assuming that the C6Z then hooks up. But a C6 Z06 on the street has no grip all too often.
As for lap times, its generally good performances are a function of very sticky tires - the OEM tires throw debris at the car just like R compound tires, very very stiff suspension, and a well sorted AWD system. But keep in mind that once the Z06 got sticky tires, it has generally beat the GT-R in most all comparisons for lap times. Lightning lap, Nurburgring (despite the GT-R getting far, far more practice at the 'ring), Motor Trends Best Drivers Car (a pretty bad beating there), and on and on and on.
The GT-R has never been a miracle of performance, and all wheel drive is not necessarily a miraculous contributor to lap times. The GT-R is very cleverly engineered, using extremely low gearing for a car in this category to jerk its heavy self off the line at an amazing rate, then that dual-clutch tranny to shift through those very tight first-3 gears without slowing the cars acceleration or having it go off boost during shifts.
And its a greatly fun car to drive, nowhere near as hairy and scary as a C6Z, but also not as buttoned down and predictable as an lp560-4. And using the launch control is a complete blast, just a ton of fun. I launch it all the time and then check what my max forward acceleration g-force was.