Very average.
It's a big space, but for some reason there's only one or two waitresses. Not every table has the call button either, which means super slow service.
I found the menu badly designed in terms of sushi combos--the smallest 1 person combo has 24 pieces and costs $26. I ended up getting that combo (between two people) with an appetizer that was quite filling for two. I suggest smaller 16-18 pieces combos. I thought of combining appetizer and rolls but it'd end up pricy and not filling as regular rolls are only 6 pieces.
Korean food (last page) is really overpriced with bulgogi costing around $16.
The food itself was decent: typical fish grade, fresh and rolls were well done.
Almost forgot to mention, they don't bring the bill so you have to pay upfront.
If they re-design their menu, I'd consider coming back (on days when the weather is bad and you want to stay inside the mall), but otherwise it's not really worth it with better choices around.