This is one of the best allies in the game. Even without the interrupt power, he can attack 3 times for 3 which is an amazing value (9 damage for 4 cards = 2.25 damage per card). Or you can defend any amount of damage, attack, then defend any amount of damage. The only aggression allies that deal more than this have special conditions (Wasp) or penalties (Sentry, Angela) or both (Hulk). The interrupt ability is just icing on the cake, but is very worthwhile whenever you have a spare energy resource and there is more than 1 minion engaged with a player since you're dealing an extra 3+ damage for only 1 resource. Things get broken when there are lots of minions and the damage becomes absurd. In fact, this is easily powerful enough to be a hero-specific ally, but it is awesome that it is an aspect card because that means it can (and should) go in nearly every aggression deck you make.