My Cali is 2.5 years old and after 220+ nights away in it, I have yet to have a real issue. For every *123,861 nights people spend happily in a Cali, there is one issue. That is the one that gets posted on here. That is the way forums work.
It would be interesting to see a real miles vs nights away vs smiles vs happy camping memories vs problems ratio. Mine and I suspect most owners would have a pretty good ratio!
(I hope I haven't just doomed myself...)
With regards to 180 manual vs dsg vs 4motion etc. Then only you can really answer that - the figures you quoted for consumption are definitely best case and in reality a 180 that does '44 mpg' isn't going to be a lot of use (other than for kipping and making tea in, admittedly) when the roads are 1' deep in snow when you live at the top of a mountain. You pays your money and takes your choice.
If the Cali were my only car, I would probably have 4motion as a lot of the roads I drive regularly are bad. They're bad enough and I drive them enough that I don't want to stick 20k+ miles on the Cali and/or batter it to bits though!
As it is, I chose not to go 4motion as I decided that if it needs 4x4 to get there or get out, I don't really want to take my Cali in the first place!
DSG however, I like. A lot. It wafts along with very little effort. Some say you miss out on the fine control, but I find that after a 200 mile journey, I can cope with it being 7mm further down the leveling block that I really wanted.
*68.7% of all statistics are made up on he spot