Another problem with it is NPCs turn hostile to you if they're in the vacinity when you use it, so you need to be really careful no ones around.
So all this goes to make what otherwise would have been a really useful shout to be far less useful and fun. Do you think this was the intention? Wouldn't it have been better for the first word to only work on animals like dogs, wolves, bears, cats (and deer and bunnies), and then the second word include bugs and trolls and so on? And for the shout itself to be, I dunno... peaceful?
I role play my characters so I'm having to ask myself why wouldn't I use it. I tell myself I'm doing a public service by killing dangerous creatures but why wouldn't I use it in an emercency?
What are your thoughts?