The angle of the M, the left hook and straightness of the J, and that the small letters are squiggles and not quickly penned letters...to name a few things.
I've seen all of those elements you mentioned in authentic MJ autos Steve. The squiggles in this auto looks like the ones he signed at Virgin Megastore in 2001. He didn't look down as he's signing. Please watch this video to see what I mean http://www.youtube.com/watch?v=t0DOni-Oz0Y