If you are only getting bad gear from legendary engrams your problem is solved, your cryptarch level is way to low, you must first level up your cryptarch to get better gear from engrams, trust me i have level 8 almost 9 in my cryptarch and ever legenday i get is blue, but im not mad because my level is not high enough to gdt legendary every time, so just level it up and youll be fine.
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How are you so sure?