Hello Sushi is pretty good for AYCE.
Roll & Grill is also decent, especially for the price. Their sashimi is pretty good, they also have a teriyaki bowl that's good and a good price.
There's a place on Orangethorpe and Brookhurst that does riceless sushi really well, although I forget their name…
Huh - no mentions of Griffin's which has refined food and fantastic cocktails, or Chubby Sushi and Ramen, which has terrific... sushi... and ramen... but both are great places on Brea Blvd. just north of the Improv.
I really wish Hello Sushi was better. Got my order cancelled twice here. I got baited on their AYCE price once and another time was okay not great or bad. I really tried to like it but didn’t work out.