To me the cavalry problem seems like an issue inherent in the Battle game mode and the maps that are played there. You're never going to be able to make the perfectly balanced map, either. Every map will be favorable to one team or a few certain playstyles in some way to some degree. If you try playing as cavalry on Siege those 5 points in Riding will effectively be dead weight that could be better spent in Iron Flesh or Weapon Master... Well, most of the time, at least.
The only real solutions that I can think of that should make almost everyone more happy is an objective-based game mode with a Strategus-like ticket system (ie Conquest) or a WPF rework to promote adding WM to builds to maintain decent damage values. Given that the devs promised a WPF rework back in August last year, I don't foresee any proper solutions coming around in the near future.
TL;DR version: All our game modes suck. Buff WM. I want to hybrid more.
