I went on a family trip in 2005 and for a variety of reason (having two kids within 15 months of the other), I didn't go back until eight years later. This fall, I will go on my fourth trip in four years, followed by a summer trip in August 2017.
I barely remember the food in 2005 (other than the time the flying seagull literally took the hamburger from my brothers hand as he walked out of what I *think* is Cosmic Ray's). We mostly ate quick service, and it was...ok. Nothing was particularly memorable.
Over these past three trips, I've only had one truly bad experience (Boardwalk pizza window) and a handful of 'meh' experiences. The vast majority of meals have been really, really good for park food, and some signature table meals have been amazing.
In my experience, park food quality hasn't gone down. In fact, at some restaurants, it seems to have gotten better. I say this because my trips have been with extended family who were able to visit WDW between my 2005 trip and the one eight years later. They've commented that a few places we've eaten at recently as a group (San Angel Inn, Chefs de France) improved compared to their earlier visits. I'm sure meal quality at most places at WDW fluctuates the same way it does in the real world...depending on management or staff changes, sometimes things go downhill a bit, sometimes things get better.
I've made a few reservations at places I've been unsure of because of reviews, and most times have been very pleasantly surprised. Sometimes, I've been downright amazed at how good the food was (Boatwright's at POR). I really think you'll be fine...one thing I can say, even the 'just ok' meals I've had at WDW have been in an amazing atmosphere, which still made the meal fun.
