I don't think that the whole U214 concept is a failure but maybe this special boat is a monday boat.
SK for example doesn't talk about problems.
A list of 400 (four hundred) defects had been drawn by the Greek Navy. Ranging from drawers not fitting properly to the most serious ones recalled earlier.
Some issues appear construction linked like sea water seeping in through the hydraulic masts penetrations, but the excessive roll on surface in rough seas, if true, is most definatively a design issue.
Vibrations at the periscope above 3 knots could be construction influenced but hydrodynamic induced, so a design problem.
AIP going down is linked to excessive heat from the fuel cells. I recall reading something about the Italian U212 having had to add a cooling system to the original design which, optimized for the cool North Sea waters, wouldn't have worked on the warmer Med. waters. So maybe the Greeks didn't anticipate that? And the Germans didn't notice.
And what about the noise? HDW has been working on a new propeller to replace the original one. That suggests interaction between water flow aft and the propeller.
Some issues are to be expected on first of class, but here there are far too many. Some could be sloppy construction, a lot are design faults.
As for the South Korean units we'll have to wait and see. On the one hand they could have benefited from some lessons learned with 'Papanikolis', on the other hand they are all to be built locally by a shipyard that doesn't have the experience of HDW. ....ehm .. or maybe that's a good thing...
(kidding)
And of course the entire dispute could have been contained had HDW not dismissed the Greek complaints as pretexts. Maybe success and high esteem do carry a price in terms of complecency.
Waylander, since you are in Kiel, maybe you could enquire directly in the shipyard (Kiel or Hamburg?) and let us know
I'm sorry about all the smilies but from the point of view of an external observer, possibly slightly interested, the entire is story is kind of funny... What's that German word for taking pleasure at other people's misfortunes?