I have to agree that Heavy Armor is underpowered and under-utilised. I often go with Dwarve^Z^Z^Z^Z^Z^Z Ironeer custom races with an Armorer champion, and I have NEVER researched heavy armor before winning the game. So even though I LIKE armor, and want to base my race around using it, in actuality the game is over before I get to Heavy armor technology.
With the research points I could put them into many things, and get great game-changing technologies like Magical Forging, why would I put it into researching Heavy Armor, which gives me a very small benefit?
To summarise the reasons why Heavy Armor is under-utilised (/useless):
- It takes enormous research to get it (better used elsewhere)
- It takes enormous resources (metal) to build it
- For heros there is better armor anyway through the magic tree
- It reduces initiative quite a bit
- Many attacks ignore it (fire, magic, etc.)
My suggestion would be to make it much more accessible on the research path and slightly reduce the initiative penalty.