People keep forgetting that the double ult buff for Drow is only effective when a melee hero isn't next to her. Lets be honestly that isn't that uncommon.
Sure she's better now but she's certainly not a top tier carry like others. definitely not the biggest buff this patch.
Silencer's buff on the other hand is absurd. He has the ability to completely shut down casters and carries, really hoping to see him picked up competitively. Last word guarantees you're going to take 300 damage and get silenced or silenced AND disarmed, plus he's going to slap curse on top of that making you take a total of 700 magic damage and 200 mana burn over 6-11 seconds. Plus he has limitless pure damage, Icefrog wanted him to be back in the scene and hopefully we get to see that.