Wampa's ability plays a great psychological card to the opponent.
Can they really afford to let the ship wander around unopposed or do they throw everything they have at it, in order to destroy 14 points?
Wampa has been used with Emperor Palpatine to change a single attack die to a critical hit triggering his ability. Howlrunner is also capable however, that's a re-roll, not a straight change. A very powerful 14 point pilot.