Hey there,
Since the patch that came out about a month ago that fixed that every purple engram you get, you would be guaranteed to get a purple, I haven't had a single purple engram drop from enemies.
However, I do get them as rewards rarely for crucible and strikes and such, but never anymore from enemy drops.
Before that patch I would still get one every once in a while (not often either, but that's why it's legendary).
My question: is it only me that hasn't had a legendary engram drop, or are there more of you out there?
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It happens, but rarely. So far, I've gotten a special (77 wizard), a primary (ascendant energy), and a class (AOS#Cryptid). Two of them, coincidentally, came from the the same room. It's just luck.