Ichiza is the most authentic Japanese food in Vegas. That is from a Japanese friend of mine. I have been going there for about 10 years. I like authentic atmosphere and sometimes that means "attitude" when in china town, but not this place. Some language barrier, but I like that aspect. It makes me feel like I am actually doing something cultural in Vegas.
Food is amazing. Waitstaff is always smiling. Always on target with delivery and timeliness. Their deserts are famous but I'm not really that into desert. Favorites Ikayaki (grilled squid), tofu salad, and the draft Asian beer is good. All the rolls are good but they don't focus on rolls. All sorts of fun things and menu changes daily.
Very casual, picnic tables and shared large tables. Really loud chatter makes it fun too. I should knock off a star for a restroom without a locking door and only one person can go in at a time.......? Hello ? Seriously. But it is my favorite restaurant so I have to give it full 5 stars.