(not a chess player by any chance …?)
Not a good one, but yeah
the AI always researches ironclads in my games and considers it a valuable tech for which it demands an excessive price in return.
True, I amend my statement: the AI often doesn't bother to research it
with a high priority. They tend to go down the Nationalism road first.
Here's one - the Explorer. Now, I know there will be those who can make a great case for this guy but all I use it for is exploring across the border to find resources (usually coal) that I lack so I can plan my next invasion commercial venture. What else are they good for?
I
adore the Explorer
This unit has won me wars! Cutting off an AI from Saltpeter or Horses in a protracted Cavalry duel is priceless
I also find flak pretty useless and don't build them much but the test should really be how well things fare in a protracted war between approximate equals. I don't have a lot of experience of balanced games in which both sides have bombers.
I like to have a good pile on standby, in case the AI really irritates me by piling all their Bombers on one of my cities. In a stack, they have a good hit ratio.
Also, about Jet fighters? Aren't they pretty useless?
They are the best unit for revealing targets for Bombers (cities are always a sure hit, of course, but catching units in transit gives you more HP-destruction per raid, on average). Otherwise, pretty useless, unless you find yourself operating under really aggravated air raid conditions: I send them in before the Bombers to soak up the AI's own Fighters and Jet Fighters (Bombers are as expensive as Jet Fighters, but Jet Fighters have a higher chance of survival in air combat, so you come out a few shields ahead).
I have another unit to add to the list, by the way: Cannon.
Seems a strange pick, but my reasoning is this: it is only marginally more effective than the Trebuchet and, while the Trebuchet, with its range of 1, operates in an environment of 1- and 2-movement offensive units, the Cannon, also with a range of 1, operates in an environment dominated by the 3-movement Cavalry. So it is pretty damned useless in offensive action. Just spamming Cavalry will usually give you the better result in a shorter timeframe. In defense, it might have its place here and there, especially at choke points, but considering that a defense consisting mainly of early interception with Cavalry is the best strategy at that time, that is one pretty narrow niche. I only build them in larger numbers for the mass-upgrade to artillery, but to be honest, I'd be just as happy to do this with Trebuchets.