I found Egypt a very enjoyable faction, right at the start you have a big war going on with the Seleucids and since several of your cities do have some developement you don´t need to put up with just the basic troops for too long. The Seleucids are fun as well, but if I recall correctly, they do need a bit of developement before they reach their full potential of their very diversified armies.
If you´ve unlocked all factions, Pontus is similar to the Seleucids in terms of diversity and Armenia is a realy challenge, wedged in as they are, though I´ve yet to play with them, the same goes for the Greek and Macedons.
I´m not entirely sure, but Spain could be interesting as well, they´ve got a more diversified army, combining Carthagian and Barbarian elements, than the other barbarians, but I don´t know if their city development stops at level 3 as well.
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