Юниты "Might & Magic Heroes VI"

Elf recruit, elf archer, elf swordsman, elf druid, elf ranger.
A great gameplay aspect.

But how is it different from "human peasant, human crossbowman, human swordsman, human priest, and human knight"? )
Especially since in Might and Magic V, the factions look normal, although less than half of the units in each race (with the exception of undead and mages) belong to the same race.