The DSG doesn't take well to quick stops and starts, such as at a 4 way stop if no one else is there. It does better if the car comes to a complete stop for a couple of seconds then proceedes to drive off. There is a technical bulletin out about this and VW says it's normal operation. I don't know if this is what you are talking about or not. If I try to do a quick stop the car doesn't make it into 1st gear and when I try to take off the car is still in second gear but the transmission will slip the clutches and reduce power from the engine untill it determins the car is going fast enough that it can apply full clutch and full power, usually about 2 or 3 seconds later.
Also you can't coax the DSG into shifting into the next gear like you can a conventional auto (letting up on the accelerator pedal when you want it to shift). My father tried doing this the first time he drove my car and all it got him was a jerky ride.
Does it shift O.K. if you use the tiptronic feature? The computer won't let the transmission lug the engine or ever rev it. You need to get the revs up to around 1800 or so before the transmission will shift into the next gear.
The transmission requires special fluid and it also has a filter that must be changed also. May need VCDS to determin fill level though, I don't know. I haven't changed mine my self.