Iberian fireships are considered by numerous players as overpowered, because most maps have lots of wood and contrary to regular warships, these don't cost metal but wood only,
while having a very high damage output.
The crush damage of fireships makes it very easy to destroy all enemy docks.
If the enemy has no more docks, the naval warfare is most often lost unrecoverably.
Current stats:
Fireship:
Attack: 10 pierce 10 hack 10 crush, 10 times per second = 100 pierce 100 crush 100 hack / sec
Attack considering armor of fully upgraded medium warships: 200 * 0.41 + 100 * 0.19 = 101 / sec -> 16 seconds until destruction (1600HP)
Attack on a casual dock: 100 * 0.12 + 100 * 0.03 + 100 * 0.73 = 88/sec -> 6 seconds until destruction (500HP)
Cost: 200 wood
Lifespan: 500HP / -3HP/sec = 166 seconds
Attack / cost: 1.5 hackpiercecrush / 1 wood
Medium Warship:
Attack: 35 pierce * 13 arrows every 2 seconds = 227 pierce / sec
Attack on warships: 227 * 0.19 / sec = 43/sec -> 37 seconds until destruction
Attack on docks: 227 * 0.03 / sec = 6.81/sec -> 73 seconds until destruction
Cost: 150 wood, 150 metal (+ 500 food + 500 wood) = 650 wood 650 food 150 metal
Attack / cost: 0.15 pierce / 1 foodwoodmetal
So I suggest to reduce the crush damage, so that it will take significantly longer to destroy docks and a bit longer to destroy ships.
We must be careful to not nerf too much, otherwise they will not be used anymore at all, since garrisoned ships have the significant advantage of
not decaying, having much more health and being able to harass and capture things.
Currently fireships also move faster than warships, which can likely stay as is.