missdirection has helped me win several games tbh... like when a mage pulled out alextrasa and set my health to 15 and had his own health at 10, the board was clear of everything else and missdirection made alextrasa attack its own hero instead of me and all i had to do was use class skill to kill him offf after that.
it has happened more then a few times.. i think you underestimate the card.
if its played at cruacial points it can get very very effective... specially when you yourself has no precense on the board but the opponent does, it can either make 2 uncomfortable cards go aw