Scrabtrapman, I was taught recently (currently learning Maya on my animation course

) that NURBS cannot be used in game engines in the same way that polygon models can.
The difference between polygons and NURBS is like the difference between bitmap and vector graphics, respectively. Instead of having a defined shape, NURBS are more a series of nodes, which are connected as smoothly as possible with curves. They can be used for 3D obviously, but really only for animations. They worked for AO/AE because the characters became sprites- it wasn't NURBS running real-time in the game engine.
So unfortunately, any models rendered in the game engine have to be polygon models, which will be less detailed. Hope this helps
P.S if any of the above is in fact wrong, sorry! only just started to learn about it!

I think its right