http://pixologic.com/zbrush/features/decimation/
All tri meshes look ruff so desimated meshes look ruff to.

Zremesher
http://pixologic.com/zbrush/features/ZBrush4R6/ 
I have a hard time with z's remesher & characters

I have better luck with MudBox

Desimate is fastest
Remesh a bit slower but a bit better
Retopolgy by hand is best but slowest

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The Artist that will fight for decades to conquer their media.
Even if you never know their name ,your know their Art.
Dark Sphere Mage Vengeance