I do hope you're joking. Between you and Shmorgusborg I'm losing what little faith I have in Americans becoming less ignorant.
Have you driven any of those cars you posted? Aside from the Z06 all those cars are slugs in the slalom. And Cobalt?? are you serious?? The understeer on that sloppy machine will make a driver suicidal. Not to mention it could stand to go on a diet, accelerating out of turns can be had faster by a paraplegic turtle.
How did a poorly planned poll like this end up in Q&A anyways??
My vote is, every car manufacturer has it's perks and needs work.
Have you seen the lap times for the Cobalt SS? It's by far the fastest car around a track in it's segment, and beats out many cars that should be faster.
By all accounts the new GT and especially the new Boss are extremely fast around a road course. And the ACR?
According to car and driver's lightning lap tests, the Cobalt SS is faster around VIR than an STI, Evo, 135i, Elise, etc. The ACR beat out a Mosler, KTM X-Bow, Zr1, LP-570, LP-670, 430 Scud, etc.
Wasn't the ACR fastest around Ring for a bit? I'd find it extremely difficult to call any car that can claim a ring time like that not "world class kinds of speed". It's currently at number 7 according to wikipedia, just faster than the GTR.
But no, to answer your question I have no clue what their slalom numbers are, so I guess I'm just an ignorant American.
I own a German car for what it's worth.