I see in the game same mechanics what make this game barely playable more then just ones (150 days).
1. Biggest problem - "flat" technology unit statistic improvement.
We have almost no improvement going to next era. We have rifleman...with is better then commando, we have tanks....slightly better then Dragon (but way way more expensive to build), we have iron ships...with worst fire power then sails ships (ship of the line have better range and almost the same firepower then destroyer!)
that generate second problem:
2. Bully tactics.
The most popular tactics here is "all vs one". I just saw attack 17 players vs 1 or even more (once it was more then 30 vs 1). I understand why people do that -because game mechanics give some bonuses for that behavior. Everybody send 50-100 units (multiply by 15-30 players) and...defender have no chance to defend (even if have some walls and towers.
It kill all the fun from game. Why to try some nice tactics, some special trick (like using "Mask of the many" or another) if you can just send more units (with few another player) and that's it!.
It is funny, when you look at normal battle with monsters, the game have some fight in rows (first the heavy units like knights, then the firing units and the last rows the healers). Sometimes the healer have no chance to heal the units because have no move in the round....but when many people attack the town....all of that units take part in the round!
So attacker have even more bonuses then in normal game vs the monster.
In my opinion, as long as the units will have almost no differences between eras, there should be some limits in join attack (like no more then 5 people in 1 days –together or in waves –doesn’t meter)
3. Hero equipment.
The same problem like with units.
We have old musket (firepower 28) and modern M4 rifle (firepower 24!), trench axe (power 63) is better then Plasma Mace (power 54) which is from 2 era in the future. The same with many many another things.
It should have some limits, like:
Muskets: firepower end at: 28
Next era rifle start from 29…go to 40
Next era guns, start from 41 ang go to 60 (for example).
So there will be some logic in that.
P.S. I’m rookie in that game, but I have a lot experience in another strategy game (like Hearts of Irons 2 ,3 and 4 or War it the Pacific and many another) so I hope that developer look at my opinion as a constructive critics and try to improve worst problems (bully situation).