No it's not a preference for a manual box per se. It's just that the DSG box is programmed to be in the highest gear possible all the time, unless you are doing something to prevent that happening. In the end, you just give in to its demands (like being married) and leave it in D. By doing that you lose something esoteric, hence, the recommendations by most of the reviews to go manual. I have actually enjoyed my DSG box but at the same time, am equally frustrated by its penchant for economy. You soon stop trying to override its behaviour as it becomes too much effort. In the manual that choice is not afforded to you. You will also find the bluemotion system deeply frustrating on the DSG box. Every time you come to a halt the engine will stop when you hold the brake pedal at a standstill for more than a couple of seconds, unless you forget to switch it off. On the manual version, the engine doesn't stop unless the car is in neutral and the clutch pedal is up. I wish you could alter this behaviour, for example, by only allowing the enigine stop/start system to operate when the DSG lever is moved to neutral. Anyway, you pay the money for your choice.
In my opinion the negatives outweigh the positives.
Too many potential reliablity concerns and costs.
Stop start system irrationality on the DSG
Penchant for economy behaviour in a sporting car.
Lack of overall control without deliberately overiding the system. (Which you inevitably won't given time and choice)
Positives are:
Lovely change with better performance figures reliably achievable.
Better ACC behaviour.
Nowt else.
I've noticed that the clutches on my 7 speed get more juddery when in a jam as they overheat.
For all the above reasons I've decided to leave the DSG fold for my GTI... YMMV
