I think there is a 'generic feel' to the units in M2TW. Especially amongst Catholic factions. Doesn't bother me though, that tends to be the case in most PC games, how many games anywhere near the scale of M2TW have individual models and skins for different men of the same unit type? I think its realistic enough anyway, factions with similar cultures have similar looking troops. CA have done a good job of making every single faction in M2TW be unique in gameplay terms.

Pretty much all the units revealed from the expansion look completely unique anyway.