What's so bad about the Gripen?
And on the topic of subs, I'm pretty sure the dumbest submarine designs yet were those which attempted to use the subs as a big gun platform, including the British M class and the French Surcouf. Had the Germans actually built the Type XI cruisers, I'm pretty sure they would've ended up in the same category. Not to be bloodthirsty, but I kind of wish one of those subs had actually participated in actual combat - it would've shown exactly what a terrible idea the whole concept was (by inevitably failing horribly and being sunk), and would end for good all the myths and misconceptions about surface-gunning supersubs.