None of our keepers save many shots. This has been the case since Hennessey got injured. How often do you watch Ikeme and think "wow, he had a great game today, pulled us out of trouble loads of times, definite man of the match" or "what a great save that was by Ikeme, didn't think he had a prayer of getting there". He doesn't save anything beyond the routine and chucks in a fair showering of abysmal goals that are purely down to him. And he's our best current option by a mile.
End result is that teams don't have to work very hard to score against us, you don't need to batter away constantly like say, we did at Brentford this season. You only need a handful of presentable opportunities, one of them will go in.