The bit about Celtic not fighting back is definitely a quality that they've lost since MoN left. Even if we went 2-0 up against that team I would fully expect them to fight back for at least a point. Although I think their team was a lot better in that era.
But I think you're being harsh on McGinn. He was full of effort and hassled Celtic when they had the ball and always looked to hurt them when he had the ball. He also assisted twice last season when we beat them 2-1.