Thanks Ricky. The GM just called me back and we will meet at the house (my son's house, actually - in Toledo, Ohio) tomorrow morning at 10:00am. I will let you know what he has to say after I meet with him.
My guess is that since the deck is 10' wide and 7'6" out from the house, rather than run one piece of the 10 foot EPDM and cut off a couple feet they decided to maximize the rubber and use it in the other direction. Then, when they got to that botched up inside corner area, they did not have sufficient product to roll up the wall. So they cut and patched and cut and patched. Not that this accounts for the poor but and patch work, but I think it explains why they needed to cut it into little pieces like they did.
I am absolutely going to demand a complete tear off and re-do. I will be diplomatic, but this is a mess all the way around and needs to be done over, in my opinion.