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And I'm probably never going to direct a movie, but I can tell the difference between The Godfather Part 2 and Plan 9 From Outer Space.

Devil's Advocate: Dude! Plan 9 is art (albeit not artistic in any sort of way that the director intended). The other analogies, okay... but cheesy-as-hell Sci-Fi flicks have sort of taken on a status all its own, as fodder for quite a bit of entertainment (see also Mystery Science Theater 3000).

Now artistically, you'd have prolly done better comparing Godfather (all of them) and Gigli.  Godfather is a masterpiece series, with a compelling (and complete) story, and drama that is palpable. Gigli is a crap attempt at a blatant money-grab, by idiot movie moguls who thought a bit too highly of their talents. Guess which one of the two folks remember?

/P