After thinking about it a lot, I've decided to change my rating to 5 stars. In my mind, something that is 5 stars is a place that completely blows your mind and you might only get to experience a few times in your life (like the time I went to Sukiyabashi Jiro). However, that's not how most people give ratings on Yelp and I don't think it's fair if I skew the rating of a really great place down. Come on Yelp, let us give half stars!
And I just have to add this comment after reading through a bunch or reviews here from people complaining that the pieces are too small: a piece of nigiri is supposed to be eaten in a SINGLE bite and should thus fit into your mouth comfortably. What is served in most sushi restaurants in the US does not fit the bill and you have to cram a piece into your mouth to put it in all at once. Smaller pieces like those served at Kabuto are traditional and proper. Please educate yourself before making unfounded criticisms.