There IS something wrong with burrow right now.

First of all, the ability has always felt bad because the animation starts way sooner on your screen then the enemies/killcam. This has always resulted in feeling like getting stunned out of burrow when it feels like you should not.

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The current problem is that it doesn't protect you from getting stunned. I've been getting my burrows cancelled consistently all day. It doesn't matter if I'm on stairs or flat ground. It does not matter if I just started burrowing or if I'm starting to charge up the end of it. This ability is broken and blizzard fucking hates venture.