Ninjas starts are amazing. That's all. I mostly don't melee tanks since they can be devastating if I miss dash+grab, which I haven't really mastered yet. But I noticed I can out run them, my ninja starts shoot fast and they do quite a bit of damage. Sure there is a delay in the star reaching them, but I guess I've just learned to time it. I also invis in and out and shoot again since this throws them off if they aim. I've also, more often than not, kill them by bouncing my stars off walls. Since my skill regeneration is fast, if they run, AND IT'S SAFE (no point in dying for a kill...just start farming your alley) I just sprint + dash and I get them. Just a tip for those who don't use all of the assassins skills.