I'm a little late getting back to this, but I'm actually surprised my comment was noticed. I wasn't trying to knock the 370 at all. I'm on here because I love the car, not to bash it. I chose differently for my own reasons, but I'm still a Nissan fan.
In response to my car not keeping up with my brother's, I wanted to share some 0-60 times from the same source, both from Road and Track on each car. If you look at the results in this test, they tested the Cobalt SS sedan at 5.4 0-60, and that's a little heavier than my coupe:
A Time for Turbos: Chevrolet Cobalt SS - Comparison Test - RoadandTrack.com
In this test, they tested the Nismo 370Z at 5.0 seconds 0-60:
The Best Production Drift Car - Full Comparison Test with Road Test Data at RoadandTrack.com
I would say, especially given that neither my brother nor I could launch his car without having the TCS come on and spoil the fun a bit, there's no reason not to say that his automatic 370Z will usually be ahead of me, but not always.
Torque steer and understeer are not a huge concern on my car. Sometimes in first and second it will pull the wheel on a rough road, but hard shifts and full power on a smooth road don't do it. In the turns it has the balance of an AWD car and doesn't push when I go full power. The 370Z, however, always felt to me like it wanted to kick the tail end out and required a lot more throttle modulation in corners. Granted, this is fun, but didn't inspire much confidence for me the way my car does.
As for exterior styling, um, sports car vs. economy car. That's not really debatable. I like that mine blends in, besides the park bench on the trunk.
If you guys really want to trash my car, let's talk interiors. I have great seats in it, but the rest of the car is pretty much base Cobalt. Cheap plastic, I can't get the trim to stay on my sunroof switch to save my life, poor fit and finish all around. The 370Z, however, has a really nice interior, definitely on par with most cars twice its price. Nice leather, great styling on the dash, intuitive layout, and nice materials all around. My only two gripes are that the sound system was kind of weak, and the fuel gauge would never show full!! Neither of those are reality interior complaints anyway.
Actually one more complaint, how come my Cobalt came with Bluetooth standard, and the 370Z didn't? Even with the sport package, his didn't have it, and being that my standard response when I get stuck in traffic is to call somebody and chat, no Bluetooth drove me nuts in his car.