As mentioned by KaleunMarco and propbeanie, the Mk 27 was limited by its low speed and inability to discern friend from foe: the most useful feature is that they can be fired blind while submerged and, if you're lucky, they might just disable a pesky destroyer or submarine chaser that has slowed down while tracking your sub. The problem is, you have no idea how fast such ships are going if you are firing blind.
Personally, after trying some out, I can't be bothered using the Mk 27 because:
a) They cost 500 'Renown' points each, while other, more useful weapons are available for less.
b) The electric Mk 18 'eels', that cost 200 'Renown' points, can be far more useful against all targets, albeit they are still limited by a relatively small range (3,600 yards), and their top speed of 30 knots means that the firing envelope against a fast moving ship is limited.
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