From an owner's standpoint, I've always gotten great villa assignments in Hilton Head and Myrtle Beach. I've only had one bad trade back into SurfWatch, where we own ... it was on a free Marriott week (don't ask!) ... we were put into OceanMarsh, which would have been fine, except that two rooms (I think #1 and #2, we were in #2) are on the back side of the building- looking at the trees, very dark; the other rooms overlook the pool area often with a peek at the ocean.
I was able to get an August week at OceanWatch last year ... just did it online as soon as the system was available. So it is possible.
I think the people who are complaining about villa assignments in SC are exchangers, and there is a pecking order for assignments...non-Marriott owners are at the bottom. It's a fair way to do it, in my opinion.
(Hope you're not a Browns fan, I'm from Pgh)