He's actually better than that. Normally ships without bomber get nothing from crit results, ships with bomber deal damage to ships and can resolve a critical effect. In Armada there are lots of things you can potentially do with crits, but a faceup damage card is still the default. Vader's ability lets him count crit results as damage results and he gets a black die to go with the three blue, so he is possibly the hardest hitting squadron in the game.
But Vader doesn't get to resolve a critical effect in armada. He is going to be doing more damage numerically, but none of his attacks (as a squadron in armada) will ever be face up damage or any other special effects.