Human: High damage. High HP. Lowest Run Speed.
Has the best skills, but as a human, the run speed does become a factor.
Dark Elf: Higher Damage. Lowest HP. Middle run speed. I believe they get gimped in either crit chance or power. But this is only because they are naturally high in this respect. They get hex ( lowers p def ) and Freezing Strike ( nuke that slows ), which does help when they land.
Elf: Lowest Damage out of the 3. Good hp. Highest run speed. Decent overall, but none is better when it comes to run speed... not to mention how Plainswalker gets blinding blow ( stab that increases your run speed ). On top of that, they get entangle... a debuff that slows when it lands.
I never played any of these classes higher than 55... so don't take this too seriously.