Every race is pretty much the same. Which makes them different is how well you use them. Many figure the "human" race as a well-balanced beginner race. They however can be the underdogs in most situations. Imo, I use Undead based upon intimidation lol and their wicked spells. They have many units like the Nigh Elves who share the ability to cast slowing, poison, and create multiple units. Undead is the type of race which requires a lot of practice. If you use them correctly, I find them as one of the more destructable races out there.

night elves are the best for rushing and if you get good at it you can usually kill people off before they get a chance. undead however have the best spells and if you get to develop with them then you can be unstopable

all the races are allout good(and bad) in their EX.own way orks are powerfull and has plenty hp but strong and expensive undead are good with spells but hp aint all that good