There is a little too much fanboyism going on on both sides here.
First, the V6 with the performance package (summer tires, GT suspension) can get very close to the GT's times on certain tracks where speeds don't exceed its limiter, and the GT is faster than the 370Z on most all road courses, so I don't think it's too far fetched to think the sport version of the V6 could be quicker than a NISMO on some tracks. Plus, we all know that outright speed doesn't really matter as the Z would be in limp mode after one lap without an oil cooler
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Second, if you think the 370Z is "exclusive" you are sadly mistaken. What are the barriers to entry that make it "exclusive?" It's a very inexpensive sports car that anyone can buy. The correct word is rare. There are far fewer 370Zs than there are Mustangs around (~10,000 370Zs sold a year vs. ~30,000 Mustang 5.0s). There's absolutely nothing "exclusive" about a $30k car.
Third, everything Trips said is correct. Instead of bashing people for their choice of vehicle, focus on being happy with yours.