I've never experienced the jerking or the noise, but the transmission is definitely programmed to upshift much too quickly for the powerband of the engine. The engine doesn't really make any power below 2,200 RPM & the transmission under leisurely acceleration will upshift to the point the engine is running at roughly half that speed. It's not an engine issue. Mash the gas & the car WILL go, and go quickly. And yes, you do have to feed it a lot of throttle to accelerate rapidly. The transmission also tends to hunt around on hills. If you leave it in 6th or in D, in cruise control it will downshift to 4th on a long hill, upshift back through 5th & 6th, and then downshift again before you top the hill. To defeat this, I drive with the tranny in the manual position. Once it downshifts, I'll click the tranny down to 5th to keep it from upshifting into 6th until AFTER the hill is topped. Unfortunately, the Acadia/Traverse/Enclave appear to be geared the same as the 1,200lb lighter Chevy Malibu which utilizes the same engine. This is done in an effort to boost fuel economy, but can be a headache for someone not used to such frequent downshifts at highway speed, nor such rapid upshifts in "normal" driving.