i thot flanking and charging were far more effective on huge sizes due to the increase of men involved in the charge tho i do agree the larger unit sizes make the troops harder to manouver into effective flanking positions
overall i find huge to be a helluva lot easier particularly on the harder difficulty levels due to the fact the ai seems to have great difficulty managing its finances effectcively
it seem to be that the game was definately balanced for normal sized units
but heh they just dont look as good