Personally I stick to the belief that if you never drive it yourself, you can never really judge it. Even though all of these cars share the similar front engine rear wheel drive layout; each is a whole different animal. The BRZ’s strength is in its low center of gravity the, MX-5 is slightly similar; while the 370Z is has a bigger mass, bigger engine & a higher price-tag. The Subaru BRZ, apparently, introduces a whole new formula into the market & here is what AutoCar had to say about these three cars (online article can be accessed here).
(Magazine scans from ft86club)