Oh, for a type IXc in the Black Sea, with all that flak and all those eels you could really put a hurtin' on the Russki's
and yes, it is underrated, it's a very good theater of operations for those hard-working people whose RL-jobs keep tearing them away from playing... short patrols, no worries about fuel consumption, even in that Canoe, no concerns that going to ahead full even once will mean you won't be able to get home except by rowing...
Did I mention the sunny weather?