better question is why not crossfire?

350Z looks good, great engine, crappy build quality.
new SLK, too expensive but nice.
Mustang, you must be kidding, solid rear axle = tractor, crappy and cheap build quality.
the crossfire has no direct competitors in my opinion.
and ignore people that say it's not a sports car.
anything that is that low, 2 seater, with 0 - 60 in 6.5 is a sports car whether you like it or not.
just because some cars are faster doesn't mean this one is so bad.
more torque than boxster or Z4.