I never really got the lack of enthusiasm regarding Numidian Cavalry. Sure, they're not Praetorians, but I've found them hugely helpful because 1) they get a nice free promotion (which of course carries over on upgrade) and 2) they are much stronger against Spearmen (which I seem to run into lots of) than Horse Archers. Sure, there's still a hammer disparity and strength disparity (7.5 to 8, in essence), but you can get them to Shock much more easily than the spear can get to formation. Since spears only have 4 base and worse fortification than archers, they'll almost always be the last units in a city.
So with NC, you suicide (or retreat) a few Shock NCs into the spears to take them out, then the archers (thank you first strike immunity) and swords are pretty much free reign, and end with rather puny axemen. Without NC, I've usually ended up just suiciding hordes of axes and swords into fortified axes and archers, at least pre-construction.
Plus, on the open field, you can pretty much terrorize any stack that's not overloaded with spearmen, which of course are useless on offense. Whereas a Sword can beat back a HA on even footing (meaning if they have iron they don't need many spears), if you have NC, they need to keep those stacks VERY well garrisoned with spears, which are a pretty poor ROI in every other regard. Plus, it's fun running over Rome and Greece's UUs with them. Hehehe
Maybe my AIs have just been building more axes than usual.
Back on subject, and speaking of Greece, I'm very underwhelmed by the expansion version of the Phalanx. Not being vulnerable to chariots is all right I guess, but unless your opponent gets out a bunch really quickly, if you get caught by a bunch of chariots and you have axes but NOT spears, you did something wrong.
I know the original version may have been a bit too good, but, well, phalanxes pretty much dominated combat until heavy cavalry and iron came along anyways, so at least it was
sensible imbalance.
Hmm, you know come to think of it, I don't even remember what their old stats were. Could someone refresh my memory?
As for other not-so-great UUs, I've never much liked Jaguars or Gallic Warriors. I know you can get GWs to be pretty good at dislodging hill-city defenders, and not needing iron is nice, but a UU that in essence just opens up one highly specific line of promos just seems a bit lacking.