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Hi Dooki. When importing an n-gon to any program which doesn't support them (such as Rhino or ZBrush) you never know exactly how they program will tesselate that face. Some (such as Rhino) slash it into the minimum # of triangles required to define the shape. Some others may break it into a series of radial triangles (like a pizza). So it's better to tesselate n-gons by hand, than to leave the decision to some devilish algorithm. Also, when you have big n-gons (or sometimes when using very long polygons) you may notice some strange artifacts in the render which is caused by vertex normal averaging over long spans. Keeping your polygons of more uniform size helps to avoid this...
jonah
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