As written my our dear friend Leondias the sarisa phalanx was a fearsome fighting force. The idea that they can't fight on uneven terrain is

. If they were unable to do so how did they defeat the Thracians or mountain peoples in Afghanistan? And the idea that you can just push into it with a scutum and chop the sarisa is nonsense. The Sarisa was powerful enough to puncture the scutum and the man using it. The best way to defeat a successor army was to kill the general or take their baggage train/camp.
And the idea "Hurr attack from the rear! Hurr phalanx can't fight then", how many formations CAN fight if attack from the rear? Because that's what happened at Cannae eh?