The vanilla GW2 actually has a very rich setup of Jormag. if you play Norn, a large part of the stories were about fighting Jormag's minions and Sons of Svanir. The Order and Racial Sympathy stories also has Jormag's minions as the villain if you pick certain choice.
There are also level 80 area to fight high rank champions like Claw of Jormag, things like the portal challenge also showed Jormag's persona to use power to lure ppl. Honor of the Waves were about dealing with the highly corrupted SoS. Plus there were the Dragonspawn in the EoD novel.
Overall the vanilla GW2 stories focus on Jormag next to Zhaitan. If it could continue with those loose ends, the Icebrood Saga could have been great. But right now it seems disconnected with the previous stories. And I don't understand why did they let Charr play such a big part in the story, it should have been Norn focused plus some kodan/quaggan/Jotun.
Personally I think Anet shouldn't have use Mordremoth, the 6th secret dragon so soon, they should have focused on Jormag and Kralktorrik while slowly setup Mordremoth' rise.