I would be absolutely outraged with Atkinson's refereeing if I was a Sunderland fan. First of all, he doesn't play the advantage and when he blows his whistle he only books Sagna. Sagna should have been sent off for denying a clear goal-scoring opportunity (which Altidore manage to squeeze past the goal line).
Arsenal did not deserve to win today and while Ozil was world class and showed it, he's not the signing that will improve Arsenal's results in the long run.