Koinon Hellenon " weakness "

[Tellos Athenaios]

I use them as a phalanxs 9 times out 10.

I don't, anymore, because:
1) Hoplitai Iphikratai are nearly as good (as phalanx)
2) Successors are better for that task
3) Mercs are better for that task

2+3 = 5) they are wasted against Successors, try mercs instead.

But I have found them effective at the wings of my armies...