Pontos is nice, but I wouldn't play it for the Phalanx vs Phalanx fights, as they really don't measure up. You got your levy pikemen, and you got your elite pikemen. The levy pikemen are decent, but get torn to pieces in an outright fight with any medium phalanx. Your "elites" are.. well, they're bad. In my experience (Pontos is the nation I've played the most), they're not much better than the medium pikemen the seleucids throws at you. And yes, this is even on medium.. Still an amusing campaign, I just found my self to be using other units than my pikemen :/
I'd really go for Epeiros, you can whipe out Macedon from mainland Greece, and hopefully they'll take over Asia minor, so you can get some pikemen action over there as well. If not, either the Seleucids or the Egyptians will be there to duke it out with you :)
(you could do it with Macedon too, I just find their units to be uninspirering :s)
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