Our Hennessey experience was moderate at best. The service was extremely slow (the place was empty except for a couple at the bar, and our table of seven waited for about 30 mins for food).
Once the food came, no one was particularly moved by the food except me and my friend. We both had their organic burger, which at $11 was an absolute steal. 9 ounce burger with bacon, cheese, and a pile of deep fried onions on top plus big wedge fries: rock solid. We also shared a bowl of yam fries, which are always pretty good.
Aside from us though, no one else had particularly good food (nachos were kind of neat -- individually decorated): pastas were not that tasty, and the soup was only "okay".
I would recommend this place to a friend on the basis of the burger alone, but I would only recommend my friend get the burger: at $11, it was an absolute steal.
The service was slow, and the ambiance was only okay. We went on a Wednesday in the evening, so the place wasn't exactly hopping.