My quick take: Service can be annoying and the food is average.
Service details: I've eaten there 4 or 5 times, and encountered service problems almost every time.
Once we had a large group--about 10 people--and one person was running late. They refused to seat us until the party was complete, and once everyone had arrived, they told us that they'd given away our table, so we'd have to wait longer in the bar. Meanwhile, we watched our table sit empty (after all, there was only one table set for 10 people) until they decided to give it to us about 1/2 an hour later.
Another time I was with a friend who ordered uni with quail egg and ama ebi with the head. The uni arrived but the waiter managed to spill the quail egg on the way to the table (it tipped over) but didn't offer to replace it. When his ama ebi arrived, it only included the raw shrimp, no the fried head/shell. We asked about it and got a shrug while being told that the chef had thrown away the shrimp head by accident.
Other times there have been very long waits after we've been seated while waiting to order or waiting for the food to arrive. (This seems to be more of a problem when you're with a larger group, and the wait isn't limited to sushi...hot food is slow to arrive, too.)