I think that I have become quite spoiled living in Tokyo for over a decade because it seems to me that the food tastes all the same. It is a casual dining experience, somewhere you would go if you are hungry but not needing to be inspired and/or impressed. The blooming onion makes a nice talk piece but make sure you have antacid in your medicine cabinet.
I am not overly impressed by the quality of the food at this location or at the one in Azabu Juban. As mentioned by another poster, the burgers lack seasoning. The portions are decent and it is nice to be able to get a beer but other than that, it is really no different than a fast food joint.
Overpriced for what is on offer. A $25.00 hamburger that is mediocre in not my idea of a good place to eat. Especially when I can cook much better tasting food at home. Perhaps it is surviving because it is frequented by non-Japanese who do not cook and crave some home-style meals? Whatever the case, it is a crime what they charge here.
It has a comfy setting with dim lighting and warm decor. Many people come here to unwind with colleagues. The restaurant part offers good eats, nice char-broiled steaks and the like. The bar is encircled by stools and it will get very crowded on Friday nights so get there early if you want a place to sit down.