Sometimes when you import text or wireframe with Get/Eps2 Soft, it is hard to get a good extrusion out of it.
A trick I use is to make it a face (if it isn't) and turn on shading with the icon mode (shift i) so you can see the wireframe on top of the shading.
If it doesn't shade properly, then you know it won't make a good extrusion. Keep modifying until it shades well.
Also, just moving points around gives you a hint as to what is the problem. Often you have a small loop where two points are over each other.