Until now my few reviews have all been 5-star, so I guess it's just as well that after finally trying this ultra-hyped Tokyo institution, I can break that streak.
Basically, I don't really get the endless hype. The food is not specifically bad, but nothing special at all. Now, I'm not exactly new to vegetarian food...have been eating it for years, and around the globe, not just in Japan. This is one of the very few times where I didn't feel all that great afterwards. Frankly speaking, my guess is that the food is not entirely "real", but processed. I'm not sure if it's just my own palate, but it certainly doesn't taste as real and earthy, and feel as good physically, as other veg restaurants I've had in Japan.
The price is average although not expensive for Tokyo station, and the atmosphere is fine I guess although it feels more like a rushed fast-food experience rather than a restaurant. The location of course is super-convenient, which I suspect accounts for the majority of its popularity.
In summary, overrated. It's not overtly bad, but definitely not worth the incredible number of very high reviews here. Frankly, I was disappointed.Pros: Ultra-convenient location
Cons: Food tastes/feels processed