Granted, it's really expensive, the food isn't as bad as you say. You seem to have ordered the generic stuff you can find at any izakaya. I ordered the foie gras which was absolutely amazing! The camembert and avocado tempura was also pretty good. The drinks are really overpriced (which is probably what burned that hole in your wallet), service is a bit mediocre, but in terms of food, I think this place is actually pretty good. I live in Japan and have eaten at many many other places. If you want cheap food, DO NOT go to an izakaya, particularly in Roppongi.