Your love/hate relationship with your Focus sounds a lot like the love/hate relationship I had with my 2010 Golf TDI before I sold it to buy my Impreza. Sheesh, what a cluster-F that car was, and VW continues to build MK6 TDIs in 2013 with the exact same problems my 2010 TDI had.
The first opportunity VW might use to fix these issues will be the MK7 TDIs that they start selling in 2014, and I wouldn't bet on that car, either.