Currently, Kamikaze feels Over Powered. Typically, pre air bombing attack of a strong place like a city with N defenders goes like this:
Suicide N attackers to soften the defenders, mop them up with N other units.
Sometimes a suicide units luckily lives, and often times a defender manages to fend more than one units, but the general principles is:
you're going to saccrifice units anyway. If the defensive bonus is too strong, and N big enough, you'll need siege to lower any defensive bonus and to deal collateral damages.
Kamikaze negates any advantage the defender might have. With the current +100% bonus on kamikaze, you're guaranteed a 1v1 trade, whether outright winning or mopping up, in situations that would otherwise need siege or more than 1 for 1 causalities.
The only situations were Kamikaze isn't a no brainer are :
- You don't have barrack/civics yet, so you value your veteran even +2 exp.
- You can bombard, typically air bombing, or archer bombard if the option is on.
- You got a sufficient tech lead that let you lose, on average, less than 1 unit for 1 using no kamikaze softener.
- You got a large number of units with high retreat chances, that you can use as softener instead of kamikaze.
Sufficient tech lead to take unfortified cities is not hard to achieve even against an otherwise equally matched opponent, but even then kamikaze renders void the use of fortification. A hill walled city, even defended with only archers, is a pain for non kamikaze swordmen to take. With kamikaze, you lose maybe 1 more sword every 5 against a wall that would have survived not facing a wall, making building wall a questionable choice.
Currently, kamikaze makes that you cannot defend with less than 1v2 units, even with the best fortifications, making surprise attack super strong.
Also from a role play perspective, it's hard to imagine why a warrior would willingly commit sepuku after winning a battle. Or is it that he is taking a lethal amount of stimulant before battle?
Anyway, I haven't tested AND much so don't weight my opinion too heavily, but I would be for pushing kamikaze a little further back (unlocked with stuffs like theocracy or nationalism?) and maybe nerfing it a bit (+50%?), so that by the time you can use it, there are enough unit variety and counter units that it is balanced with alternatives (high retreat units and collateral siege).