its becouse MTW, was a extreamly simple game, as said, it was risk based so that got rid of all the AI problems in the camp map.
there were only a few slight changes and variations and numbers of units, think rock paper scissors, and then look at a civ pull out.
the way seiges were done compared to now is kind of lame, but i do agree, dismounted units would be handy :)
the battlefield AI is just not that good, it stands still as you rip them apart by arrows,and i could win ridiculous battles of a few thousand kills agasint a hundred at the most. the majoiry of a time,
the design of the mouse button was terrible, i really to prefer romes, so you do not have problems.
i loved the game as it came out, same with shogun, just as i do (and its mods) with rome, but no matter what you say, rome was a step in a good direction in terms of giving people more gameplay options, and dragging the series out of the dark ages (so to speak). it was a step that should of been taken and thank god they did.
MTW is a good game, but not amazing. or considerably better than rome, ok rome was dumbed down, but the options gave to us allowed the possibily of these great mods as well, so that balances it out.