This place is not "big" anywhere except the ego of the people that run this place. Came in on a Thursday night to a relatively empty dinning room and got seated at the bar. Our orders were not taken until 10 minutes later, even though we sat next the the cashier. Finally, we got the orders in and the real nightmare started.
First, the neighbouring table that came in after us received their food before us. We had the miso ramen and the tuna tataki donburi; in my mind, our order wasn't anything overtly extravagant. My ramen was lukewarm and the noodle was overcooked. Although I am relatively competent in using chopsticks, I was unable to pick up the noodles without having them break up and fall back down into the flavourless brown liquid that claimed to be miso broth. Perhaps this was to allow the less proficient chopstick users to scoop up their food with the spoon. On the bright side, the pork slices were generously portioned. And the soft boiled egg was relatively flavourful.
My dinner companion's tuna tataki donburi was less tragic. It was heavily seasoned with miso paste and perhaps sesame oil. It was fortunate that the dish was over-sauced because the tuna had absolutely no freshness to it. The rice was overcooked and for some strange reason, very oily. There was a pool of tasteless grease that collected at the bottom of the bowl. At least the shredded cabbage used to garnish the dish was crisp.
The menu has been revamped since the place first opened and visited by celebrity chefs. It now resembles Momofuku of New York (not a huge fan, to say the least). Given the strong ramen/izakaya trend that is happening in the city these days, it is very hard to believe that Big In Japan is still relevant.
TL;DR. Service was bad, food was atrocious; don't go.