I'm a Hard Core Foodie (I test recipes for 2 magazines); IMHO AP is good, but not great. With that said, _I_ am not a fan of cooked salmon, so I have not tried that signature dish. The berry cobbler tastes like homemade, good and solid but not WOW in any way--unless you don't regularly have homemade cobber! LOL! The steaks are consistent and of good quality and preparation, but overpriced even by WDW standards. The wine list is extensive and I understand it is wonderful, but as I don't drink wine, I can't comment--however others rave. I think the portions are a bit sparse, again considering the price.
A comment on alcohol (and I am NOT anti-alcohol!) 2/3 of the most recent times I have been, about 7 pm ish, there have been large tables with groups very much under the influence, loud and bawdy. One of the times before I could say anything, my BFF who is a judge commented that they group should have been cut off instead of served more and she sure hoped nobody was driving.
Again YMMV, but I think the best signature dining is Jiko and Citricos.