Is Deceleration spell useful?

[IanTheWizard]

By the way, these spells (Deceleration Slow, Haste Fast, Paralysis, etc) could have been useful and made the game more fun to play.

But I think they weren't implemented properly and now only exist to serve as disappointments. What a waste.

I really hope there could be a new patch to fix these issues. And I also hope the patch could introduce some summoning spells which enable you to summon creatures who fight for you.