Absolutely awful. Still no improvement from year one on these. Over 3k hrs and 4700 grimoire but I have a better chance to slay a Black Unicorn then to get a shader drop from anything.
Edit 1: I have noticed that shaders show different ways to obtain them based off whether you're in the app or online at bungie.net. For example lion dancer. App shows it is obtained from defeating Crota in Crotas End. The website says cryptarch packages. There are several more.
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I had a bunch the first couple of weeks of TTK then none at all until SRL. All those dark squares in the big ipad is quite annoying.