I think too that none of the spear class weapons is OP, not even the pikes.
Yes, fighting against someone who is supported by a pikeman is a pain in the ass, but so is if the supporter has any other weapon, e.g. a poleaxe, a two handed sword or even 1hd+shield. I say a pikeman is not a better support than a two hander is, because latter is also capable of swings and thus he can attack in situation where the pike can't. And in addition to this the 2hd is the more versatile class in general.
Of course, there are very capable players with pikes and spears, but ask yourself if they would be less successfull with a two handed weapon or sword and shield. WIth the same amount of dedication and skill I would say: no. If anything, better.
You can also be sure that if you slightly buff hoplites/pikemen so that their numbers increase a little bit, people will get used to fighting them which will again make the life of a spearman more difficult. I guess a good amount of kills spearmen of any kind score is because players underestimate them and think they would be an easy target where you only need to downblock and then outspam them.