PMabey said:
numidian cavalry are not good against any units , there is no reason to want to use them above regular horse archers or any other classical units
1. vs. axemen. numidian cavalry will easily beat them but chariots are better. (8 vs 5 compared to 7.5 vs 5)
2. vs. swordsman. axemen are just as likely to beat swordsman and you get them quicker
3. vs. spearmen. axemen are much better
4. vs horse archer. not good they'll lose against them most of the time.
5. vs archers. i'd prfer a normal horse archer
6. vs catapults. I'd prefer a normal horse archer
This would be a valid argument if you never encountered more than one unit at a time. Then you would just pick the most appropriate attacker to maximize your odds, and you'd never use the numidian cavalry for anything. In practice, since the best defender is always selected, it's much more useful to look at the worst possible odds a unit gets when attacking instead of the best.
What if you're attacking a chariot, an axeman, and a spearman stacked together? Your axeman gets trampled by the chariot (8 vs. 5). Your swordsman is chopped to bits by the axeman (7.5 vs. 6). Your normal horseman is impaled by the spearman (8 vs. 6). The numidian cavalry, on the other hand, will fight the spearman at 7.5 vs 8 with a 30% chance of withdrawal if he loses. True, he's still probably only getting about 40% victory odds, but that's substantially better than any of your other options. Give him a shock promotion, and the numbers swing in the other direction.
The numidian cavalry isn't a great unique unit, but it doesn't suck. It's OK. Not the best, not the worst, and that's exactly how it should be, because ...
PMabey said:
Its annoying cos everything else about carthage i like.
... and you've just answered your own question. This is the best reason of all not to make numidian cavalry better. Carthage with a more powerful unique unit would be ridiculous. You'd never play any other leader. Do you really feel so handicapped by Charismatic, Financial, and +1 trade routes from harbors that you
also need a kickass unique unit before the leader is playable?