Rhaelys,
I personally think that hoplite is OP... But not so OP that it deserves a nerf. It's just that they have much more length then a 1H while using a shield, thus being great in group fights, but not good at 1v1's because of the 1 attack direction.
I'm also not implying that you should be ably to use a lance and 1 hit anything on foot, my point is cav.
if you use a lance on horseback it should 1hit most anything if your going full speed on a fast horse.. (courser, destrier, arab)
When you use lances on foot (except light lance) it's nearly impossible to do good couse there too slow. Thus you bring a different weapon.