The magic system in Heroes V [Discussion]

I want to ask, does anyone use the "Fire Trap" spell? In my opinion, it's a useless thing.

Before patch 1.3, it was a mediocre spell, but now it's awesome!:D Of course, if you're fighting against melee units. There's a little secret to using the spell. You need to leave some cells empty where you want to place the mines, and cover the rest (25 - the number of mines summoned) with something. For example, hover the spell zone over the army and, if necessary, shift it slightly off the battlefield; then the remaining free cells on the field will be filled with mines!