While I've reviewed their unit roster, I've never played the Moors. I've only trounced them in Spanish campaigns. They don't seem to last long in any of my games.

From the stat guides, the UM and Lancers seem ok, but UM are swordsmen so cavalry will eat them for lunch. Lancers are outclassed by European knights, but that's a problem all across the Muslim factions.

To the OP's point, the Christian units are really the best units the Moors have for European invasion. Not using them is just gimping his own game.