I usually only come to Sushi Rock during its half off days. Compared to other sushi restaurants in the area, I think Sushi Rock's is only a-okay. They could do better in their quality and amount....specially with the price that they are charging (hence why half off days are worth it!).
Sushi Rock (the one @ beachwood) is good for its atmosphere, i think. At least that's why I usually come here.. but I must say, they have got to work on their service a bit more. I sat out in the patio because it was such a nice day out, and our waiter was pretty darn slow. We got seated without any utensils or soy sauce. And once we got our food, we had to wait another 10 - 15mins for a different waiter (because our waiter forgot) to bring us out our utensils. Then it took an even longer time to get our bill.
Overall, I'd say their sushi is okay quality. But if you want to go on a date or want a good atmosphere, then Sushi Rock would be nice.