For a quick lunch, not bad. Not great but not bad.
Upon entering the restaurant the sound from the TV was blaring Olympics coverage. We were the first ones in and they turned it down after we were seated.
Our server was competent and professional but lacked any enthusiasm. Only 4 tables seated and we didn't get top up of hot water for our tea or cold water. Took a long time to get the bill. I would say service was 3 by 5.
There are two key things in sushi I look for. First is good rice. Second, decent and consistent portions of meat on said rice.
In my case I felt that for $2.45 for one Toro, the portion size was about 25% too small. And, the rice was mushy and starchy. Was hard to get past that texture for me. The hand cones came first and were not like that. The nigiri and subsequent roll was mushy, so likely got a poorly prepared batch of rice.
On the food I would probably say 3 by 5. There is a lot of sushi competition in the surrounding area and I would be hesitant to try Kanpai before any of the others in the area first.