I dont know, I have beaten the computer pretty easily, but I would modestly say I am pretty good at the game. Basically it likes to send 3 or 4 units at a time to your base just like in starcraft. However, you can easily kill them and get the much needed experience.
What is really fun is a 12 player FFA against the computer. Intelligently, all of the comps do not simultaneously rush you so it is actually quite doable and fun since you end up getting 10th level heros and several expansions
I mean, what the hell do I know about Warcraft 3? Its not even out yet :Q