The CTS-V is a Nurburgring car. It's developed for large difficult tracks, not drag racing. I know this is probably hard for some of you red-blooded americans, but the car was not made to stoplight race.
With it's power, sure it does a respectable job there, but it isn't what the car was built for. The suspension has been praised many times over for pulling the trick of making the heavy CTS feel like a sports car (it's a 5-series sized car that handles at the level of the much smaller 3-series; that speaks volumes about how well thought out the suspension is).
The other route GM could have taken was to make it a straightline monster, but this would assuredly give up some of the amazing handling characteristics and we would have just another "american car" that can't navigate a corner properly.
If you want a four door muscle car, go to the SRTs. If you want an american built car on the level of Germany's finest, buy a V.