How to aim?

[Niezdara]

Pikeman looks like the worst class indeed. The low amount of ammo combined with the even lower chance to actually hit makes ranged as pikeman on horseback rather useless. Adding to that, most polearms are not useable on horseback.

I'm going to disagree a bit. Most polearms are not usable, but those that are, have a very long reach (longer than 2h and bastards). A naval glaive works like charm, and a snake halberd is good too. An ammo count is low, but a damage is high. I think the preferable target are enemy horses, but you may also help archers and destroy shields. From my experience easiest way to hit with throwables is to do it while passing by. You just approach like you are going to coach and throw at very close range. In that case you also have bonus damage from speed. Another good thing is that you can use shield and throwing weapon simultaneously, although I think a shield becomes useful only after16th wave (since shotgun archers). Throwable spears are actually a good stabbing weapon too, at least early in run. I think I'm going to try to take a lance, a glaive, javelins and pick up spare shield after the last spawn and play much like a commando. A high polearm proficiency should help you deal even more damage while coaching.
To sum up, I would not try to play the same way as archer and rely more on polearms and lances.
BTW About an xbow - a chosen marksman with eastern repeater have a rather high kill speed. His bolts often hit through shields and destroy them faster which helps a lot.