I've never gotten more worthless rewards than what i get from mnemonic engrams. I've fully leveled the season pass and I've only ever gotten shaders i already own and garbage legendary ghosts and ships. There are supposed to be loads of legacy exotic cosmetics in them that i guess just aren't allowed to drop. At least give me duplicate protection so i don't keep getting worthless shaders over and over and have a chance for new items.
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All I'm asking out of the thing is the Sweepmote. I either had everything else interesting in that engram prior to the season or got it early on.