I have had a great meal and great service at California Grill the only time I dined there.
I've been to Flying Fish three times - the first time was awesome. The second time was not as good. The third time was better than the second, not as good as the first.
Dined at Jiko once - my husband loved the food, but agrees we had subpar service. I didn't enjoy what I ordered.
Our last meal at Narcoossees was OK, not fantastic, but a while ago. Even longer back we had a GREAT meal there.
Artist's Point was good when I was there in October. Service was unobtrusive, food was good.
Some of my opinons on the meal are colored by the company I had - the first meal at Flying Fish and the meal at Cailfornia Grill were with my family - the kids were in a great mood, we all had a great time. The Jiko meal the kids did fine with, but weren't excited to be there. The Narcoossee's meal was our first time bringing young kids to a signature place - Narcoossee's is a good choice for that, but I ended up feeling constrained by the amount of time my kids were willing to give to the meal as preschoolers. The last Flying Fish meal I had misbehaving friends with me - the food wasn't as good as the first time, the service was poorer, but had we not had the friends we had with us, it might not have been as disappointed.