I've been lucky enough to eat in some of the best restaurants at WDW.
MK, the Crystal Palace is good, but The Liberty Tree is the best I've been to. Tony's Town Square I wouldn't recommend at all. Poor service, long waits. Five adults cramped onto a standard size table not good.
MGM, Sci fi Diner, great fun anytime. Brown Derby, beautiful food, well served but expensive, 50's Prime Time, good fun....... once. Mama Melrose, terrible service, absolutely terrible, left us until we complained at every course. Tables all round came and were served and finished around us. Treated rudely by the hostess, don't know if it's because we're Brit's or what. The only time I've EVER had to put my irate shareholder hat on and properly complain. The hostess was repremanded and we were given free fastpasses as compensation. Avoid at all costs. ABC Commissary does a great breakfast though.