hmmm, although 'nazi's' are a recurring theme, I wouldn't call it 'important' (the only series without any nazi eps I can think of are TNG and DS9, unless you'd interpret the cardassians as nazis). That is, I've never really felt it to be integral to the Trek
saga, more of a 'ohh, let's do an EVIL NAZIS IN OUTER SPACE-story, as we can't think of anything else this week!' - the result usually being a somewhat silly episode imho. (although I do like 'patterns of force').
But, if you like that stuff, by all means include those eps in your list
By contrast, I would
include a 'holodeck malfunction'- ep, just to convey the idea. But only one of them