most drive by wire cars have some sort of delay, it "smooths" out the throttle based on signal from the pedal.

The thing this guy describes sounds like an under power issue from him leaving behind his corvette, mustang etc to test the aveo,
Any decent driver should be able to adjust to a car within an hour or so. He talks about stalling the car etc, ive done that on a few test drives when clutches/throttle response and such have been very different. My r32, when i test drove it, i stalled it at every light, as it was my first hydraulic clutch i drove in a long time (at the time).