They have single damage boresight beams. Their secondary weapons are also boresight, so they tend not to get a large number of shots.
Yes, they have 2 turns on their ships, but the ships tend to move too fast to take advantage of that when the battle gets up close
Sure they have an 8ad fighter that is -1 in a dogfight. if you have your fighters on close support duty they will intercept that Sky Serpent before he can fire.
Dave
I don't disagree with any of Daves points above I was just trying to outline some of the advantages of the Drazi.