My wife and I are in the middle of the fourth season now, and as much as I love it, it's really obvious during this rewatch how much they had to compress things when they thought they wouldn't get a fifth season. They spent the better part of a couple of season building up to the Shadow War, and then it was over in just a few episodes. Maybe what was cut out was a lot of filler, but I feel that some genuine content got lost along the way. It just feels like the build-up was like reading a novel, and then you just get a summary for the war itself..