In no special order... we liked them all.
California Grill - great food and service... I like the sushi appetizers. The filet steak was great! Superb service. ADR at 5:30pm... enjoyed the sunset. Kind of noisy here.
Citrocos - great food and service. Quieter restaurant. Visiting the Grand Floridian lobby before/after dinner was nice too. Small orchestra playing music alternating with piano player. A few nice shops. Lots of nice floral arrangements.
Narcossees - food was very good. Service great. Food at Citrocos was a little more "fancy" in presentation.
Jiko - great food and service. I liked the gift shop in the lobby. Quieter, I'd say more romantic than the others.
Have not eaten at the other signatures yet. We are looking forward to trying Flying Fish and Hollywood Brown Derby, and definitely returning to California Grill, Citrocos and Narcoosees.
Hoop Dee Doo show (2 meal credits) was a lot of fun and you might enjoy that if you have never seen it. Kind of like the old Hee Haw show that was on TV years ago.
Spirit of Aloha was OK... the food menu was fixed but I thought it was good. We had front row seats, and I think a lot of the other seats had a very poor view.. the place just is not designed well for views. The fire juggler was the best part.... BUT, you can see the fire juggling in front of the Polynesian Resort as part of the welcome the night ceremony. It's 15 minutes of drumming and fire juggling in preparation for lighting the resort's tiki torches. When we were there in 2009, it was Tues through Sat. at 6pm. Then you could enjoy a nice meal at Ohana - Aloha style.