Well, I didn't judge it only that, in point of fact. I laid out an entire case against it. Come to think of it, I laid out my case twice, mate.
Not really, you don't take into consideration opportunity cost, they can do a lot of damage during their time and bring in a lot of money. The fact that you haven't managed to achieve that, doesn't mean it's impossible.
Note, I never said they are fantastic. Just that they are decent and not as bad as I thought they were before I tried them myself recently.
And of course, upgrade paths for a unique unit are a major consideration.
Nobody will argue with that. But there are many units that lost advantages upon upgrade and still remain beasts (which manducavs aren't) during their time.
I've been playing Songhai a lot lately, but all the same with the various folks defending them (and no support on my end), I thought I might be judging them too harshly. Maybe they work great, topple cities like dominos, and I was just too conservative in using them.
They aren't great, but they do work if you use them properly. If what you describe was true, they would've been OP, don't you think?
So, I loaded up an old game and decided to throw five Mandys at a city, no holds barred.
http://cloud-2.steampowered.com/ugc/559843377765945717/9CB528B3ABBAD5414C6FDF759BE8B6856059A9E9/
Here they are preparing for their first salvo. Note that by the time I'm ready to attack, there's an Incan knight standing where one of my Mandys used to be. But ah well, I still have four mighty Mandys attacking without the standard-issue -33% shaft. Surely that will do the job, Especially when we consider that projected damage output in the left-hand corner there. I doubt Cusco could take more than ten or twelve more hits like that before folding up like a lawn chari.
http://cloud-2.steampowered.com/ugc/559843377766114129/0AB41C914E22110B697A2CBCA537D4221C4F9CBF/
Here they are after giving it all they got.
http://cloud-2.steampowered.com/ugc/559843377768470171/B41A5D84BFBAF0F92F75D30A8563725A2EB3914A/
This is after a second round of smashing their faces into the city. Sticking around means death for one unit, minimum. It doesn't look a war of attrition will go in the Mandys favor.
Now all you need to do is to double their amount and start attacking 80-90 turns earlier. It's not their fault you go offensive with 5 knights and some CB's at 180's against GW.
These are SS of 'no ranged challenge'. I attacked Babylon at ~100 which is not super early. Took Dur-Kurigalzu and Babylon, liberated Singapore, after Akkad I got Edrine and clear path to Istanbul in a peace deal. Nabby had lots of pikes, so the whole campaign was somewhat long. But Istanbul will fall in 6-8 turns, they have only one additional city to the north, and then I will proceed to Persia and the last civ I haven't met yet. At the same time I'm amassing second army which will try to go through Dutch lands. It's mainly hills and mountains so it's gonna be somewhat painful. I might need to wait for cavalry at least to take down core cities.
At first it's not easy to capture cities just with manducavs without support of siege/range. But if you have enough of them and can rotate so you don't loose any, they'll gain promotions very fast. With march, they become unstoppable. Now you'll say again that plain knights are the same, but they are not. Manducavs are more effective due to their unique perks.