Flak certainly needs some love. I like of the flak arcs as long as it can be aimed ahead of time. The vast majority of the time the missiles I am concerned with are behind my ship. Having to aim on each individual missile and fire multiple shots to take each one out, all while waiting for too long of a cooldown, makes flak a chore and unpleasant to use.
I'd love to see flak earn a spot on my ships.