Yes, lets not forget that in the simulator assessment it is rarely the actual flying skills and outcome of the sector that is the biggest element being assessed. I know someone recently who actually felt he c*cked up right royally by messing up a hold and flying the ils so badly he ended up with a missed approach. He was offered the job as his CRM was judged to be top notch and as he wasn't rated on a 747 the fact that he had issues flying it was not a job killer. So as stated above, even if you feel the check was spotless the examiner was probably sitting there asking himself one question over and over 'would I enjoy flying with either of these candidates'. It is harsh and you may have just encountered an 'odd' examiner but I wouldn't think challanging the sim result would be a wise move.