I think it's interesting that this criticism keeps coming up when talking about Paschendale lately. Personally I think it's really refreshing and appropriate for the subject matter. For Maiden epics when the music dies down you'd expect it to go into a quiet section. Rime, Sign of the Cross, To Tame a Land, Seventh Son...they all do this. It's a signature stamp of Maiden. But there's none of that in Paschendale. In fact every time the music dies down and the morse code thing comes back, the music gets more intense. And I think it captures the war zone imagery well. In an epic about such a deadly battle, there's no room for calm/quiet section. Any brief moment of relief is quickly followed by more grinding riffs and theatrical vocal performances.
It's ironic really. One of the most consistent compaints about the reunion era is the epics following the same formula of soft intros/soft outros and the like. But then you get an epic that breaks those rules and people still criticize it. Go figure.