You can't expect to get an exotic every time you do nightfall, it is supposed to be somewhat hard to come bye.
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I'd rather get strange coins or 3oC. Low light legendaries suck especially since I can get them from the heroic playlist faster.
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Nightfall legendarys can now be earned at 310 light.
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And exotics are going to either be 290 or 310 for me. I would still rather get SCs or 3oCs than a shitty legendary I can get from the Heroic. Not to mention the bosses won't drop legendary engrams anymore.