Cav is not hard countered by infantry unless infantry completely bunkers up. I'm fairly certain if there are statistics on class effectiveness, cav would have quite a higher average k/d and damage deal than any other class. Not to mention how much a bump changes a fight.
You would not have say this if you played cav on different warband mods.
On cRPG, bumpslash damages are heavily reduced, while it isn't on other multiplayer mods ; lance can only be used to attack towards the front direction, while on other mods you can turn 180° while attacking. In addition to that, the high number of ranged of all types doesn't help when it comes to support the team and do some kills in general, because the horse armor value doesn't follow the huge amount of damages delivered by arrows/bolts/throwing weapons (it's true on Strategus battles, it is even more true on EU1, it only requires 5 bodkin arrows to take down my +3 plated charger, bs imo).
About bump effectiveness, it can be temperated if we consider that cRPG is the only warband multiplayer mod to give footman players the ability to make a roll on left/right so you don't get ganked if you pay attention to the game.
So please, don't tell me cavalry cannot be countered easily on cRPG, if it was that good, you would be able to see way more players actually playing that class. From my own warband experience I can tell that cav is way more stronger on ALL other mods, and it doesn't really bother the players.