If you think Falmond isn't a Nuke, you haven't seen him in action. He can 1 shot entire teams sometimes. If they try to hide behind defensive buff? No problem, Burning Courage will strip them away.
Godseeker has so much rezzing. She can even rez herself if she dies not to mention she's pretty tanky.
Sanguinia really does do a good job, build her with high speed and res and she can get the team out of AOE stuns and remove those defense reduction or Weaken buffs enemy teams like to cover yoru team in with her A3. She can protect the team from Debuffs while also keeping up a heal with her A2 and her A1 can strip away enemy buffs sometiems while also dealing some damage.
I have Fenax and he's pretty good but the problem is with Falmond and Martyr my team is already 3 Spirit heroes. I have a few other Sacred Order Legendaries: Gilseah Soulcaller, Roshcard the Tower, He-Man, Archbishop Pinthroy, Astralon. As far as epics go, I have Deacon Armstrong and Lodric Falconheart. Falconhearts shields on 2 turn cooldown is pretty nice but I do end up missing Sanguinia's debuff removal when I use anyone else.
So OP, I do think you are conflating wanting to play the game your way and the issue being the meta. It's possible you don't have all the champs you might need but even within Sacred Order you have much better options available to round out a team.
If you are serious about trying to improve it would be better to post your roster to get advice/a second look. (and show some of your builds, as well)