so i just spent the last 30 min talking to a good buddy of mine who works at buyers   
from what he says the diesel engine in the Vw is titts but the car will fall apart around the engine. between it eating wheel bearings and breaks, the tranny going out..it has potential for being a headache.   
he reinforced the pro diesel idea   
regular compression ratios of 1 :15 plus 30lbs of boost. one hell of an engine   
regularly seeing 400-500k mi engines   
power gains/fuel economy with simple mods like freeing up intake, opening up the  
exhaust and ECU mods   
cons 
injection pump problems. if it does goes you are looking at atlest a 3000 pricetag to repair.   
for the most part, according to him, vws are crap.(engines good)   
the jeep liberty 4cys diesel are terrible. they stoped making them and upgraded toa 6cyl which is amazing. has more hp than the hemi.   
winter time youve got to keep it plugged in, or else running th risk of frozen fuel lines, and in theory spliting things open     
he really likes the diesel trucks with emphasis on the powerstroke.