He may not be the hardest, but eating an elemental fruit pretty much confers instant badass status on people. Everyone else we've seen with one is up there in the lists - Ace, Aokiji - and if Luffy wasn't a non-conductor, he'd be screwed.
Yes, I know it's an old argument, but seeing as no-one but Luffy and other elemental users can attack him, I'd say he's pretty hard.
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