I don't know if this is redundant to mention, but pikes underperforming terribly in Medieval 2 has been a problem pretty much since launch. The standard fix that many mods (Stainless Steel, TATW, etc.) use is the removal of pike units' secondary weapons, since they switch to them way too frequently and generally fail to behave like actual pikemen if they have a secondary weapon. If they only have their pikes they tend to maintain formation and fight in a manner closer to Rome 1 phalanxes.
It's been mentioned in the thread before that the lack of a secondary weapon is why pantodapoi can beat pezhetairoi - I just wanted to add that it's been a Med2 engine issue from day one.
(I'd add a link to a bunch of threads discussing the problem but apparently I'm not allowed yet. Quickly googling "medieval 2 pike fix" should throw up more than enough info, though)
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