Dodge, block, or kill the fucking mount, otherwise run up into the hills and on top of rocks where mounts can't get you. They aren't godlike where they work in all situations.
It's like you all put on rose-colored glasses and forget what dice rolls actually do. You may think "Oh this will fix EVERYTHING, cause mounts are OP and I hate that!" But in reality the dice roll would extend to ALL forms of combat, and it would be poorly implemented or not though through. Where every mounted person falls off after one lucky strike or arrows flying at him.
The point being that if you should be able to do it with active abilities like Spear Stance or use specific weapons like poleaxes and bill-hooks to dismount mounted troops like those weapons were DESIGNED to do.
NEVER EVER EVER Fucking dice roll in a game "Where skill matters"
If you dont have the skills or the intelligence to realize that infantry do not rule the open fields then you are going to die. Simple as that.
Use your tight packed formations with minimal spacing so cavalry can't single you out, or go up into the mountains and hills where you will have the advantage, put yourselves on rocks where you will also have a better advantage. Hell mounted troops can't even really touch you if you run around the trunk of a tree!
Quit crying, and LEARN TO FIGHT YOU PUSSIES.
Then they should take out dice-roll knockdowns that all of the Mounted Combat crowd defend so much. That is also a dice roll. If people can have random dicerolls to knock people down on the floor, they can have them to knock them off their horses. Can't have it both ways and just say 'adapt', that's bullshit.
People can't adapt to fight mounted without going mounted, that's the fucking point of why they are so overpowered. If the way to fight polesword users was only in using poleswords yourself then that would be overpowered too in exactly the same way. No-one cares that in history cavalry ruled the battlefield, this isn't ARMA Medieval, it's an online game where you supposedly have choice to fight effectively in what suits you as a player to do. An Apache Helicopter would fucking destroy ground fighters to, that doesn't mean that just because you invest -number of points- into it you should get it in game. No-one wants it to be piss easy to kill Mounteds, a lot of people like me -have- Mounted characters, but you have to give people a way to counter each style in the game, even if it is difficult to pull off.
The point is about balance and risk. People on foot are currently risking a hell of a lot more than those on mounts for a simple few hundred points, unless their opponents are fucking idiots who either stand still, disconnect or crash. That is the only window of opportunity.
It's mount up or go home, one simple investment of a few hundred points nullifies every foot investment and that isn't balanced and you shoot someone 5 times with a fucking bow on their mounts and they will just ride away like nothing happened. It doesn't matter what you do to people on your end, it's completely down to them fucking up.
Mounts in real life ruled the battlefield, but people didn't fucking ride around using them like they do currently in mortal. If people stopped in the middle of a group of six warriors, they would get dismounted, overwhelmed and royally fucked, but that isn't possible in Mortal. There is no tactical way to play against mounted other than -hit them fucking hard and hope they are idiots or get stuck-.
That's it.
To be honest everyone's horse realism arguments actually only back up what ground fighters want. They want realistic ways to dismount people, just like it is physically possible to do IN REAL LIFE. It wasn't that you sat in a saddle and were suddenly invulnerable to everything and glued to your horse.