I'm not sure what BP is going on about. Macedonian pike phalanx? Of course not. Hoplite phalanx, certainly--but probably not the triarii. Early Roman armies did use hoplite style phalanx warfare. Livy and Dinoysius detail the army composition of that time referred to as the Servian system. Some time around the Samnite wars the Romans ran into serious trouble (and earlier Rome had been sacked by the Gauls.) The Samnites fought a bit differently apparently with more skirmishers, maniples and a dual line system referred to as duplex acies (or acies duplex...) The terrain of the Samnite wars was mountainous and ill suited for hoplite warfare. Apparently the Romans adapted their armies as a result of their experience with the Samnites. They didn't seem to adapt the cavalry though to the same degree...and this would come back to haunt them later.

Many of the city states in the Italian peninsula opposing rome were Greek colonies, fighting hoplite style.

Carthage used the phalanx to some degree. They certainly did during the 1st Punic War when the Spartan trained mercenary Xanthippus criticized the way the Carthaginians had used their troops previously, so the Carthaginians ended up placing him in charge of their army! The Carthaginians were drilled and formed up in phalanx. The phalanx held against Regulus legion's attack at the "Battle of Tunis." They probably started the 2nd war in hoplite phalanx form as well, although there is some suggestion that they might have re-armed in non-hoplite manner after Hannibal had destroyed several Roman armies in Italy early in the 2nd Punic War.

Now the game's depiction of the hoplite phalanx is probably wrong (the spears are overly long and probably not used in the right manner.) That's another matter altogether.