Wow, a lot of misconceptions on here. There's probably a lot on here just reading what others have written and spewing it back out. When I was shopping a few months ago, I was directly comparing the BRZ, V6 Genesis Coupe, MX5 Club, and 370Z. I liked all of them and it was difficult decision.
They are ALL very different. The 370 though is in a different league. That's not a slam, but they are meant to do different things. In terms of all out performance, the 370 is light years ahead. It has far more grip than any of the others, corners flatter, and is far faster than all but the Genesis (which sounded the nicest by far). If fact, it makes my Cooper S feel like a bloated floating pig.
The 370 is also the nicest to simply be in. I want to point out that I did NOT buy this to autocross or run track events, the same as 99% of other buyers. If I were buying for that, I probably would have went Miata. Not that this should matter, but on the interstate, it feels relaxed, even at triple digits, the others feel strained and nervous. It's far closer to a Porsche than a Mazda, and feels somewhat similar to my old 944 Turbo in that regard.
And contrary to what was written early, the Nissan is the toughest to get in and out of. The Frisbee twins are easy by comparison, as most Toyotas are. Throw out the old man notions of ease of entry being the determining factor. Most likely it's price. Mine is a Touring with a Sport package; list price $42k new. I could have bought the BRZ like I wanted for $28.5k out the door exactly like I wanted. I drove the 370 10 minutes later and that was it. The extra cost didn't matter is was such a better car.
The 370 isn't perfect, but no car is. After a few months, there are a few things I would change and am going to. Mainly the spring on the clutch and better shocks. In reality though, there's probably less I want to change on this car than any other I've had. I'm still happy with it and the view out the back is not as bad as others make out. I've driven several FR-S's after I bought mine, and I am still happy with my direction.
Others may have a different view or need, but slamming a car based on what others say who haven't driven one doesn't make it true. Of course what the Nissan guy said is also crazy, but I'm sure he doesn't represent what everyone at Nissan thinks.