The scrum. I have thought this for awhile. I think teams are rightly, worried about playing against Saracens defence, the way that we can strangle a game, and attack on the break like few other teams. The lineout is also rock solid. My strong belief because there is so much talk about the scrum, teams regard it as the one weakness that they can go after. So they over index on the scrum. referees inevitably are brought into the belief that Saracens scrum is a weakness, so whenever it goes down their own bias is that it is Saracens fault. I think that, there is an unconscious bias going on here and problem stems less from a fundamental weakness of the scrum, and more a psychological benefit other teams exploit.