To date I have been to Wow Sushi twice and both times the meals were very good. It is a small establishment with maybe 8 tables inside, but it was full both times i went there, meaning the food must be good.
Overall the sushi/sashimi platters were very fresh and the selection was good in a sense that nothing too strange was on the platter. The salad/miso soup were both great and the service was quite quick. They even brought us a free dish at the start which was extremely nice.
For me it is not a destination spot to travel too, but definitely a good choice if you want sushi and are in the Yonge/Bloor area.