Looking for the first boss fight that you can use it:
Stone guards - Popping mines
Feng : dropping flames
Gara : /shrug
Spirit kings : Avoiding Flanking / Annihilate
Elagon : Dropping stacks quicker
Will : already answered.
There's a fairly good use for it on every fight in MV, and there's still possible uses in HoF. So i wouldn't call it bad.