I find Mario final bosses usually kind of lame. Galaxy 2 had a good one because it had that cool (albeit very easy and simple) little bit at the end of it, but otherwise the 64/Galaxy set suffered the issues of it being almost identical to the fights you had twice before. Now Donkey Kong Country, there's a cool final boss, what with the great music and the fake out on the credits.
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Mistake you're making - overlooking the fact that we might not want to be saved.