As one of the few Chinese delivery restaurants, I have to give China Sea credit. They are consistently good. I wouldn't say that they are usually great - but they are always good. You can count on calling in and your order arriving within 15-20 minutes hot and above average.
We've been brave enough to try their sushi on a few occasions, the Ohio Dream roll is actually quite good! I've never been inside - so I can't say that I would go there to eat-in, but for delivery - it's okay in my book.