My only problem with ganking in DS3 is when there are four of them in an area with the sole intent of waiting for invaders. 2v1, ok w/e. 3v1? Difficult but managable if you're careful. 4v1?? Wtf. Now, if they are legitimately just progressing through the game in co-op, that's fine. But when you're waiting for a 4v1 and rush one guy all at once? It just seems like a jerk move to me. Edit: Also, if you're an invader helping them 5v1 gank, you are scum.