Yes you are right. I know that Max has some problem with N-gons in OBJ.
I'm trying to refine the export in moi, I'm a totally newbie.
In any case thanks for the link of the plugin (and thanks to Guruware).
Unbelivable that a free plugin is better than a commercial software.
Now Autodesk as acquire Alias, hope this help with OBJ import!

Bye
Luca