HOW ABOUT ROLLING ALL THE WINDOWS DOWN AND REFLECTING FOR A SECOND THAT YOU ARE BREATHING THE CLEANEST AIR WHILE LIVING IN ONE OF THE MOST BEAUTIFUL PLACES ON EARTH?
Nothing is wrong with your transmission. In Drive, the trans will up shift sooner, even at a low speed to save you gas, which the 2012 is exceedingly good at doing. Learn to appreciate it.
The behavior of any turbocharged engine/trans is the same in a high gear at low speed. It will feel like its bogging down but it's really fine. Don't forget that your engine makes it's power via a turbocharger that has to SPOOL with exhaust gases before it can make power. It can't spool efficiently in a high gear at low rpm when the exhaust gases are moving slowly. The ECU will do it's job and determine, based on throttle position and more importantly LOAD, when it's necessary to downshift.
If you want more responsiveness, put the trans into Sport Mode, then it will stay in a lower gear, thus higher rpm and your turbo will be making boost. Every turbocharged engine/trans combo has some form of "lag", even the most advanced variable geometry turbine systems have a little. The 2.0TSI has very little lag compared to my 944 Turbo due to the smaller size of the turbocharger in the Tiguan. Get used to it.