I must admit, despite loving the game - especially the first part before the tower - I was disappointed when the content seemed to dry up in the second half. Ya, there were still some interesting things to do, but it felt a lot less organic. I really hope they keep things more personal all the way through in whatever sequel may come. All that fortress action was a bit meh.
It really was like, "Yes! Finally! I'm ready now..." and then almost nothing, except for fortress raids and a few side quests on the mountain sides. Still, despite how negative that sounds, it took me several days to play through and was very enjoyable.