Why are chariots so effective in killing cavalry? ( Is it historically correct?)

[seienchin]

I hoped they will be removed in EBII, but they dont seem to be... They were rediculous in EBI. Everything about them was broken. They are even deadly to riders when they flee... They can run like 40 times through a infantry unit without beeing slowed down too much and let everybody fly in the air and still nobody is dead...
In Rome total war they were annoying because they were so strong (Interesting cause I only recall that empires who used them eventually lost against cavallery or infantry centered armies...), but in EB they dont make sense. Esspecially because everybody is so hard to kill (Which I really like. Ebs battles are awesome. :) ) and than there are the chariots, wich are laughable against infantry and let everybody fly in the air or force to the ground (They actually act like modern racing cars smashing through a crowd of people), but kill cavallery even when fleeing or when atacked in the back...