Im guessing from these two comments that cavalry is king in this game? Are infantry underpowered/overcosted or just hard to use effectively?
Cavalry is indeed king. But put even poor infantry in a forest, and the cavalry can't touch them. Put them behind a wall, or up a slope, and whilst the (heavy) cavalry will still probably chew the first rank unit to pieces, it will likely get mauled in the process and be unable to follow up properly.
So really, terrain is king, or the use of terrain is king in WM.
But saying that, most infantry is still overpriced for its effectiveness compared to cavalry. Or you can look at it the other way, and that heavy cavalry is too cheap. You jsut need look at WMA where 3/3/4+ save cavalry costs 125pts, and every order after the first suffers an additional -1 command penalty to see this. And in WMA support counts before casualty removal, which when 2/3 of your unit being attacked gets wiped out in the first round of combat, it really makes a huge difference to combat results. And combat being limited to two round, and of course supporting units counting as being in combat, it all really adds up to a slightly better balanced game IMHO. Takes a bit longer to play though...