Shields don't nullify pikes. In spear/pike warfare you are never attacked from straight ahead. It's usually the pikeman on either side of the one you are facing. Also, ATS used to fight in a Phalanx style back in the day and they were pretty effective. If you REALLY want to see those tactics used in-game you should play some Vikingr during one of their events. It's pretty crazy.
Also, the Greeks beat the Romans many times during the Pyrrhic War. They did pretty damn good considering the fact that Greece wasn't united and was also under-funded and under-manned compared to the Romans. If the Romans had invaded 100 years earlier (before Greece was falling apart) I think the results would have been VERY different.
The Romans also got their asses handed to them many times by the Carthaginians during the Punic Wars. The Carthaginians also used the Phalanx during that conflict.
Pikes were also incredibly effective in Medieval and later periods. I'm guessing you've never heard of Swiss Pikemen? Pikes dominated battlefields until the introduction of firearms.
Getting attacked by the pikemen on either side of the direction your facing? Wouldn't you be getting flanked if that was happening, all the battle formations ive seen are two long lines of infantry going at eachother head to head. Youd also have to be heavily outnumbered to be getting flanked on both sides. So pikes could be effective if they are flanking the enemy? Really? so is everythign else. The Greeks beat the romans in two land battles in the phyric war, and those victories were both "phyric" victories meaning the greeks lost so many men that they may as well have lost the battle. If we had more time last night at hanun and had gone on to win the battle that would have been a phyric victory for us.
The greeks still lost the war, and the greeks had war elephants which make a huge difference. The only reason carthage won any battles at all was because of hannibal, they were like the French, completly useless without napoleon. Hannibal was like George Washington, using advanced tactics and trickery to prevent his troops from having to go head to head with the roman legions were he knew they would get crushed. Not only that htey had war elephants which were to a large extent responsible for winnign many if not all of their battles. Also the the majority of their army was made up of barbarian mercenaries from spain, not phalanx troops.
Yes when i think of troops and nations that dominated the medival battlefields, i think of the Swiss and there pikemen, gaurding the Pope in their fancy uniforms, they did such a good job. I dont think about the English long bowmen or the French knights that actually dominated the battlefield.
As far as the Greeks being weaker and "divided" in the later wars, the opposite is true. Greece was divided into small city states that were always fightin eariler in its history. Later on greece to a large extent had been united by Macedonia, a much larger and more powerful force than the spartans or athenians would have been. The selucid empire was also huge, much bigger and more powerful than the earily greek city states.