I think using phalanx is alot of micromanage to put them into right positions and not moving them to much around when engaging the enemy army. This makes them as i feel vunerable and it feels like an out of date fighting style. Its very easy to defeat hellenic armies with phalanxes with versatile units like light cavalry and missle/skirmisher units.
I think for using a army with phalanxes successful it all depends how you use you rear units to force the enemy into the center getting smashed by the long phalanx pikes.
Just stand still and wait for them to come to you
"When the candles are out all women are fair."
-Plutarch, Coniugia Praecepta 46
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