I've been to Yellowtail 3 times now and each time the food quality has regressed. The sashimi was warm and were not fresh. The spicy salmon items tasted very artificial and just ... bad. Hot food did not have much flavour and was at best ordinary. Maki and hand rolls were okay relative to other items on the menu.
Although the food ranged from mediocre to bad, they had excellent customer service Overall, I would not recommend trying the food at Yellowtail when considering the several other options for AYCE sushi in the GTA.