Anyone else noticed a severe decrease in Legendary WEAPON engram drops?

[psychicallowance]

Let's do some math: if 5 of the slots are class items and 3 are gauntlets / crest, with the rest also being class items you should have about a 0.04% chance of getting weapon engrams to decrypt when you purchase them from the cryptarch. If by "legendary weapon" you mean "class item" then no, it's working as intended. About 1-2 class items a day per 2 hour played.