Very disappointing. I am a big fan of the Osaka chain, and have been to both the Henderson and Sahara locations, so when I found a Groupon for the Summerlin location I snatched it up.
The only good thing about this restaurant was that we didn't pay full price. First the hostess was busy talking to another employee when we entered and seemed bothered that we had walked in. She asked "How can I help you?" Which seems pleasant enough but was a strange greeting for a restaurant. When I replied that there were two of us she apparently expected me to tell her whether we wanted dining, sushi bar, or hibachi grill, as she seemed annoyed that she had to ask and I hadn't originally specified. This wouldn't have even bothered me if the rest of the experience had been good, but no such luck.
The atmosphere (which is usually the last thing I care about) was very lacking. Dirty seats and walls. Paper instead of table clothes. Instead of the dim lighting adding ambiance it seemed like it was covering up a dilapidated interior.
The menu was completely different than others in the chain. They did not have my favorite dish (spicy chicken) and so I chose the chicken teriyaki. The chicken was dry and not very flavorful. The rice was no where near the Osaka standard I have come to expect. And prices were nearly 40% higher than the Sahara location.
The waiter was decent but not great. We didn't even stay for dessert, which is my favorite (Tempura fried ice cream! Yum!), as I didn't want to be further disappointed.
If you want to really experience Osaka try the Sahara location!