I haven't tried them in EB - have they been nerfed? In vanilla, they are far from crappy.

Personally, if they were literally only used once or twice - like the flaming pigs, IIRC - then I would ditch them in the interests of historical accuracy. Or nerf them so much that the player will not want to use them.

But if they were used more often then keep 'em but model their effectiveness to be what you feel is historical. (Were they really good against cavalry? I can see the scythes being an issue but thought more generally that cavalry made chariots obsolete - they would certainly be more manouvrable in a melee).