This place is kind of hit or miss depending on your attitude with crowds, line-ups and your overall mood (patience). I liked Kazu when I went, but I would have to be in the mood for it to go again.
Reason being the line-up and the general lack of space on the inside. There is NO ROOM to set up for a nice meal, you'll need to pack light (drop off whatever bag you might have somewhere before coming) and be comfortable hitting elbows with strangers.
Other than that I enjoyed the food and the many unique dishes the restaurant has to offer.