I've stayed at two AIs (the old Coral Marien Hilton and Casa Marina), and while the buffet never made me sick, there came a time when I just couldn't deal with it anymore. A person can only handle so many servings of mystery meat, watery marinara, and soupy-goulashy-stewy-whatever in a lifetime, and I went over my quota long ago. My understanding is the offerings at your hotel are similar.
My advice? Try some of the great restaurants in the area. In Sosua, you'd be hard pressed to find better food than Rocky's and Morua Moi. Cabarete has tons of great spots, all sitting right on the beach. You'll get MUCH better food, get out and see the area a bit, and enjoy your vacation more.
Good luck and have fun,
DRob
