No executive lounge at this (or any) Hampton Inn. Of course, breakfast is free for everyone, so it's largely irrelevant at this point.
As a Gold, your expectation should be the Hampton Touch - a snack and some water - and that's it. Otherwise, I stayed there a couple of years ago, and found it to be fine. It's right across the street from the big mall in Ann Arbor, and there are some restaurants in the vicinity.
Mike