We've been to all 3, and I liked Narcoossee's and the Luau the best. Yes, the show is sort of silly, the food is ok, but we had FUN! Narcoossee's--the food was excellent, the view is great and watching Wishes there was a wonderful experience.
'Ohana--eh, ok. We had a late reservation though, so we didn't get to see much fun stuff going on. The food was totally mediocre (except for the bread pudding) and we won't be rushing back there.