Weird import rotation issue / possible coordinate system issue (so someone says)

I posted this question on gamedev and concept3d got back to me. I think he is off the mark, but also not exactly sure what the deal here is either. The question is below along with the images.

Basically when I import the model he is off by 10 to 20 degrees and he is kind of rotated wierd on the Y-axis by 5 to 10 degrees.

What could I have done in blender to cause this issue?

I can supply the .blend file if someone wants and can do testing if someone asks. Just not even sure how to diagnose this issue.