It shouldn't be possible to roll 5 or 7 strange coins in the Nightfall strike when you can get a guaranteed 9 coins from doing the weekly heroic which is considerably easier. You just feel cheated when it happens. Materials and coins are fine as a reward, but getting less for doing more is just dumb.
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I'd rather get a legendary than the strange coins. But, thanks to Nightfall I have a bunch of strange coins for Xur. Maybe he'll sell something decent that I don't have.